In sociology, social interaction is a dynamic, changing sequence of social actions between individuals or groups A social interaction is an exchange between two or more individuals and is a building block of society. Social interactions can be studied between groups of two (dyads), three (triads) or larger social groups. By interacting with one another, people design rules, institutions and systems within which they seek to live. Symbols are used to communicate the expectations of a given society to those new to it.
Thumbnail: Looking north up Broadway from 43d Street, New York, USA. Image used with permission (Public Domain; Jim.henderson)