Psychiatrist John Bowlby described attachment as an inborn system: when frightened, a person seeks closeness to whoever offers protection and feels safe near them (Bowlby, 1969). For toddlers, that’s usually their parents; in adults, a partner, close friends, and often parents too take on the role. The system switches on most strongly under stress, illness, or separation.
An attachment style describes the usual way someone runs this system. Some people find it easy to ask for support and just as easy to spend time apart; some fear being left; some prefer to cope alone. These habits grow out of experience, and psychology has studied them for more than half a century, since Bowlby.
A word about children: their attachment is studied with different methods, and the childhood categories don’t map onto adult styles one to one. From here on, this page is about adults and how the system of styles works.
