Attachment is one of the most fundamental psychological constructs in explaining children's emotional, social, and cognitive development, and plays an important role in forming a sense of security, trust in others, emotion regulation, and adaptation to new situations. Attachment theory, proposed by John Bowlby, is based on the principle that a child needs to establish an emotional bond with their primary caregivers from the beginning of life in order to maintain survival and achieve psychological security. This bond helps the child to use the presence and support of the caregiver as a source of calm and confidence when faced with threatening, anxious, or unfamiliar situations. The quality of early interactions between the child and the parents, especially the level of responsiveness, emotional sensitivity, behavioral stability, and predictability of the caregiver, play a decisive role in the formation of attachment patterns. When the caregiver responds to the child's emotional needs in a relatively stable, appropriate, and reliable manner, the ground for the formation of secure attachment is provided, but unstable, rejectionist, cold, or unpredictable response can increase the probability of the formation of insecure attachment patterns. Insecure attachment refers to a set of communication and emotional patterns in which a child faces difficulties in ensuring the caregiver's accessibility, regulating anxiety, and maintaining a sense of security. These patterns are usually described as avoidant attachment, anxious attachment, or ambivalent, and in some classifications, chaotic or disorganized attachment. Each of these patterns can be associated with different ways of coping with separation, caregiver return, and stressful situations. In the avoidance pattern, the child may show more independence on the surface and not show an overt emotional reaction when the parent separates or returns, but this behavior alone does not indicate a lack of attachment or a lack of inner anxiety. In the anxious or ambivalent pattern, the child is usually more sensitive to the caregiver's approachability, experiences significant distress in the separation situation, and may also have difficulty achieving calm after the caregiver returns. In the avoidance pattern, the child's behaviors in attachment-related situations may lack coherence and may be accompanied by fear, confusion, or conflicting reactions. It is important to investigate the relationship between insecure attachment and separation anxiety in children because both constructs are related to feelings of security, emotion regulation, predictability of relationships, and the way of dealing with separation from a caregiver, although they are not conceptually identical and should not be used interchangeably. Separation anxiety in children refers to intense and disproportionate anxiety or fear about being away from parents or other attachment figures and can manifest in situations such as going to school, staying with a substitute caregiver, sleeping alone, or being temporarily away from family. A certain amount of discomfort during separation is normal in the early developmental periods and is part of the attachment development process, but when the intensity, persistence, and extent of these reactions exceed the level expected for the child's age and interfere with the child's daily functioning, a more accurate assessment becomes necessary. Separation anxiety disorder arises when the symptoms are consistent with the relevant diagnostic criteria and cannot be explained solely by a normal developmental response or environmental conditions. From the perspective of attachment theory, the child develops relatively stable mental patterns from repeated experiences of interaction with the caregiver to shape his or her expectations about relationship security. These mental patterns, sometimes known as internalized work patterns, help the child to make predictions about the availability of others, their self-worth, and the likelihood of receiving support in difficult situations. A child who has been repeatedly faced with unpredictable responses may be less confident about the likelihood of a caregiver returning or receiving support after returning in situations of separation. Such expectations can affect the intensity of worry, the degree to which confidence is sought, and the ability to tolerate temporary distance from parents. In this framework, the relationship between insecure attachment and separation anxiety can be explained through several possible mechanisms, including greater sensitivity to threat signs, difficulty in emotion regulation, fear of loss of support, and decreased confidence in the ability to cope with unfamiliar situations. However, insecure attachment alone is not the definitive cause of separation anxiety, and not all children with an insecure attachment pattern develop clinical separation anxiety. Also, children with relatively secure attachment may show significant signs of separation anxiety in situations such as sudden family changes, experience of loss, parental illness, relocation of residence, or entry into a new educational environment. Therefore, scientific explanation of this relationship requires simultaneous attention to the child's individual characteristics, the quality of family relationships, environmental conditions, and life experiences. One of the important mechanisms in this relationship is emotion regulation. Emotion regulation refers to the ability to identify, understand, modify, and adequately express emotional states and develops in the early years of life largely through co-regulation with the caregiver. When a child interacts with a sensitive and responsive caregiver in the face of fear, frustration, or discomfort, they gradually learn that unpleasant emotions are tolerable and that adaptive strategies can be used to manage them. In contrast, unstable or rejective interactions may limit the opportunity to learn these skills and increase the likelihood of using ineffective strategies. A child who has difficulty regulating emotions may not be able to manage his or her anxiety well during the breakup and may remain dependent on the immediate presence of the parent to reduce tension. In some situations, this dependence is accompanied by prolonged crying, refusal to go to school, physical complaints, or repeated requests to ensure that the parent returns. However, the occurrence of these behaviors alone is not enough to conclude the existence of insecure attachment and should be investigated in the child's developmental and family context. From a cognitive perspective, children in the developmental process form beliefs about the likelihood of threatening events, their ability to cope with danger, and their trustworthiness to important people in life. In some children with insecure attachment patterns, the separation situation is likely to be accompanied by more threatening assessments; for example, the child may perceive the parent's departure as a sign of the possibility of an accident, abandonment, or loss of support. Such perceptions can increase predictive anxiety and cause the child to show signs of worry before the breakup occurs. The repetition of these concerns may lead to the formation of a cycle of fear, avoidance, and temporary relief. In this cycle, the child avoids the separation situation or demands the permanent presence of the parent to reduce anxiety, and short-term reduction of discomfort can reinforce avoidance behavior. If this pattern is repeated repeatedly, the opportunity to successfully experience separation and learn that temporary distancing does not necessarily mean danger is reduced. On the other hand, parental reactions can also play a role in perpetuating or reducing this cycle. Parents who consistently exclude separation situations out of intense anxiety may inadvertently send a message to the child that these situations are dangerous or unbearable. Conversely, a sudden confrontation, ignoring a child's fears, or forcing them to separate without adequate preparation can also exacerbate feelings of insecurity. The appropriate approach is a combination of validating the child's feelings, creating gradual opportunities to gain independence, and maintaining a predictable framework of emotional support. In this process, the goal is not to emotionally distance the child from the parents, but to help them maintain a secure bond, the ability to tolerate temporary distancing and manage worry. A child's mood characteristics are also important in the relationship between insecure attachment and separation anxiety. Some children are naturally more sensitive to new stimuli, are aroused more quickly, and need more time to return to calm. These traits can increase the intensity of the separation response, but they are not in themselves a sign of a psychological disorder or insecure attachment. The interaction between mood and environment determines how much opportunity a child has the opportunity to learn effective coping strategies. In families where the child's individual differences are considered and support is provided tailored to developmental needs, it is possible to gradually develop independence and tolerate failure. In contrast, constant comparison of the child with peers, blaming him for fear, threatening to leave, or using separation as a tool of punishment can increase his anxiety. Threats such as leaving the child alone or the parent leaving without informing them may undermine the child's confidence in the predictability of the relationship and turn everyday separations into stressful experiences. Therefore, consistency in the caregiver's behavior and a clear explanation of when and how he or she will return are important factors in supporting a child's sense of security. The quality of the parent-child relationship is not the only factor affecting separation anxiety, and family structure, parental conflicts, the level of social support, economic conditions, and adverse life experiences can also play a role. Chronic conflict between parents may make the family environment unpredictable and make the child more susceptible to the possibility of loss of support or changes in relationships. In situations of parental separation, the departure of a family member, hospitalization of the child or parent, grief, and a sudden change of caregiver, the likelihood of anxiety reactions increases, although the type of reaction depends on the child's age, the meaning it gives to the event, and the amount of support received. Entering a kindergarten or school is also a situation where individual differences in tolerance for separation can be revealed. A child who has previously experienced gradual separation, emotional support, and a predictable return of the caregiver may adapt more easily to the learning environment, while another child may need more time and support to build trust in the teacher and the new environment. However, the initial problems with adjusting to school should not be immediately attributed to insecure attachment, as the quality of communication with the teacher, the classroom conditions, previous educational experiences, and the way the child is welcomed also play a role in the process. From a research point of view, investigating the relationship between insecure attachment and separation anxiety requires the use of valid and age-appropriate tools for the child. Attachment assessment should rely on methods that are designed for the studied age group and examined from a psychometric point of view, because observing the child's behavior in a limited situation or relying on a person's report cannot reveal all aspects of the attachment pattern. To assess separation anxiety, clinical interviews, parent-teacher reports, observation of child behavior, and valid questionnaires appropriate to age and culture should be used. Combining information sources helps to reduce assessment errors and increases the possibility of distinguishing between normal developmental reaction, situational anxiety, and clinical disorder. One of the main challenges in research in this field is the separation of statistical relationship from causal relationship. If a study shows that insecure attachment scores are correlated with the severity of separation anxiety, it cannot be concluded solely on the basis of this finding that insecure attachment directly causes separation anxiety. Variables such as parental anxiety, family conflict, traumatic experiences, child's temperamental sensitivity, or parenting styles may play a mediating or moderating role in this relationship. There may even be a reciprocal relationship, in the sense that the child's intense anxiety influences the parents' behavior, and the parents' overprotective or anxious reactions in turn reinforce the child's difficulty in tolerating separation. Longitudinal studies that look at children at several stages of development can be helpful in clarifying the chronological order of these relationships, although they alone are not sufficient to prove causation. Another limitation of the research is the differences in the operational definitions of insecure attachment and separation anxiety between different studies. Some studies focus on observing attachment behavior, while others use parental questionnaires or the child's own reports. These differences can make it difficult to compare the results and cause the level of communication reported to be not the same across different samples. In addition, parents' reporting may be influenced by personal concerns, their perception of the child's behavior, or their desire to present a favorable picture of parenting style. In contrast, young children may not be able to express their internal experiences with sufficient accuracy and clarity. Therefore, it is necessary to use multiple methods, examine the psychometric properties of the tools, and pay attention to the cultural context in interpreting the findings. Culture can affect the way in which independence is expressed, the degree of desired closeness between parents and children, expectations related to independent sleep, and the time to enter the educational environment. Behavior that is considered a sign of over-dependence in one cultural setting may be part of the usual pattern of family care in another. Therefore, the diagnosis of separation anxiety should be based on the severity of symptoms, their disproportionality with the level of development, continuity, and dysfunction, rather than on general and uniform criteria about the child's independence. In the field of psychological interventions, findings related to insecure attachment can help design programs to enhance the sense of security, regulate emotion, and increase tolerance for separation. One of the important axes of the intervention is to improve the sensitivity of parents to the child's emotional symptoms. Training parents to recognize fear signs, respond calmly and predictably, keep promises associated with return, and avoid emotional threats can help improve a child's experience of the relationship. These interventions should not focus on creating more dependence or permanent parental presence, but should combine emotional security with appropriate opportunities for developing independence. In children with persistent and disruptive separation anxiety, age-appropriate cognitive-behavioral therapy can include identifying concerns, correcting exaggerated perceptions of danger, teaching relaxation skills, practicing problem-solving, and gradual exposure to separation situations. Gradual exposure should be tailored to the severity of the child's symptoms and ability, and should be accompanied by a clear and predictable plan. Avoiding separation situations altogether may reduce anxiety in the short term, but limit the opportunity to learn and gain corrective experiences in the long term. On the other hand, intense and unprepared exposure can increase distress and decrease a child's confidence in the treatment process, so it is important to match the pace of intervention with the child's capacity. Parent-school cooperation in implementing the treatment plan can help to establish stability between the home and the school environment. For example, setting a specific schedule for entering class, determining a short, quiet goodbye, identifying a trusted person at school, and fostering adaptive behaviors can reduce the turmoil of separation situations. Rewarding your child's efforts to deal with fear, rather than focusing solely on eliminating symptoms completely, will help strengthen their sense of empowerment. It is important for parents to know that the appearance of anxiety in the early stages of practice does not mean that the intervention will fail, and that progress may be gradual and fluctuating. In cases where there are problems with the parent-child relationship, family conflict, or traumatic experiences, it is essential to pay attention to these factors alongside the treatment of anxiety. Also, if the symptoms are severe, accompanied by a decline in academic performance, sleep disturbances, frequent physical complaints, or a persistent refusal to separate, it becomes important to have a professional evaluation by a child psychologist or mental health professional. One of the important suggestions for future research is to conduct longitudinal studies with diverse samples in terms of age, gender, economic status, and family structure in order to investigate changes in attachment and separation anxiety during development. Another suggestion is to study the mediating role of emotion regulation, sense of self-efficacy, risk-related beliefs, and reassuring behaviors in the relationship between insecure attachment and separation anxiety. Investigating the moderating role of factors such as social support, quality of relationship with teacher, relationship with other caregivers, and parenting practices can also help to more accurately understand the conditions of increasing or decreasing vulnerability. Researchers should use standard tools, multi-reference evaluation methods, and statistical analyses appropriate to the nature of the data, and also explain the effect size and methodological limitations in the report of the results. Conducting interventional research to compare the effectiveness of parental education, cognitive-behavioral therapy, and family-centered blended programs can also provide valuable practical evidence. At the prevention level, teaching parents emotional responsiveness skills, providing gradual and age-appropriate separation opportunities, preparing the child before they enter school, and strengthening emotion regulation skills can help reduce adjustment difficulties. These programs should be designed to recognize children's individual differences and avoid labeling children who are more sensitive to separation. It is also important to educate parents and educators about the difference between insecure attachment and separation anxiety disorder, as misinterpreting a child's behavior may lead to blame, excessive support, or limiting opportunities for independence. Theoretical evidence supports the view that the quality of early relationships may be one of the factors associated with the development of separation anxiety, but the intensity and manner in which this relationship manifests is not the same in different children. Understanding these differences requires a multidimensional perspective that takes into account the interplay between attachment experiences, mood characteristics, cognitive and emotional skills, caregiver behavior, and environmental conditions. Once a child has sustained emotional support while having the opportunity to gradually experience independent situations, he or she can gradually learn that temporary separation does not necessarily mean loss of relationship or exposure. Such experiences provide the basis for the development of trust, self-efficacy, and psychological flexibility, and allow the child to adapt to new environments without abandoning his natural need for emotional connection. Scientific and specialized attention to the relationship between insecure attachment and separation anxiety can help identify vulnerable children early, design interventions tailored to their needs, and improve the quality of family interactions, an approach that emphasizes strengthening a sense of security, developing coping skills, and building supportive and trusting relationships rather than focusing solely on reducing anxiety symptoms.