Introversion is "the state of or tendency toward being wholly or predominantly concerned with and interested in one's own mental life". Introverts tend to be low-key, deliberate, and relatively less engaged in social situations. They often take pleasure in solitary activities such as reading, writing, drawing, watching movies. An introverted person is likely to enjoy time spent alone and find less reward in time spent with large groups of people (although they tend to enjoy interactions with close friends). They prefer to concentrate on a single activity at a time and like to observe situations before they participate.

Introversion is not the same as shyness. Introverts choose solitary over social activities by preference, whereas shy people avoid social encounters out of fear.