根据词典，“attachment”指的是一种非常深刻和长期的情感关系，这种关系将一个人与另一个人在时间和空间上联系在一起(Ainsworth et al.， 1978;鲍比,1969)。依恋在本质上并不总是相互的。例如，Bowlby(1969)观察到婴儿非常依恋他/她的母亲，因为后者喂养前者。依恋并不仅仅意味着喂养是任何亲密关系背后的主要原因。哈洛和齐默尔曼在他们的“猴子研究”中正确地指出，对于婴儿来说，除了食物和住所之外，还有其他原因，如情感支持和接触。人们已经注意到，来自父母或照顾者的拥抱、触摸或赞扬等认知反应会促进孩子与世界交流的尝试;因此和那个人产生了强烈的依恋。
According to dictionary “attachment” means a very profound and long-term emotional relationship that ties one person to the other across time and space (Ainsworth et al., 1978; Bowlby, 1969). Attachments are not always reciprocal in nature. For instance, it has been observed by Bowlby (1969) that an infant is highly attached to his/her mother as the later feeds the former. Attachment does not only mean that feeding is the main reason behind any bonding. There are other reasons like emotional support and contact along with food and shelter which are essential for an infant as rightly being pointed out by Harlow and Zimmerman in their “Monkey Study”. It has been noticed that cognitive responses like cuddling, touching or praising from parents or care giver boosts a child’s attempt t communicate with the world; thus develops a strong attachment with that person(s).
It has been noticed that any insecurity of attachment has long term impact and will increase the danger of psychopathology. For instance it has been seen that children who have insecure attachment in the early childhood days have the tendency of developing improper communication skills as well as low social skills which have direct impact on their self-esteem. It has been also observed that children have the chance of developing anxiety disorder and have the chance of failing to cope up with stressful situations in their later years of life if they have an insecure attachment phase in their early childhood days. Thus in the future there is a chance of failure to express right emotional reactions in stressful situations (Bowlby, 1969).