Attachment theory focuses on relationships and bonds (particularly long-term) between people, including those between a parent and child and between romantic partners. It is a psychological explanation for the emotional bonds and relationships between people.

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The theory suggests that people are born with a need to forge bonds with caregivers as children. These early bonds may continue to have an influence on attachments throughout life.

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Although attachment styles displayed in adulthood are not necessarily the same as those seen in infancy, early attachments can have a serious impact on later relationships. Adults who were securely attached in childhood tend to have good self-esteem, strong romantic relationships, and the ability to self-disclose to others.