A ritual may be or may not performed on specific occasions, or at the discretion of individuals or communities. It may be performed by a single individual, by a group, or by the entire community; in arbitrary places, or in places especially reserved for it; either in public, in private, or before specific people. A ritual may be restricted to a certain subset of the community, and may enable or underscore the passage between religious or social states.

The purposes of rituals are varied; they include compliance with religious obligations or ideals, satisfaction of spiritual or emotional needs of the practitioners, strengthening of social bonds, demonstration of respect or submission, stating one's affiliation, obtaining social acceptance or approval for some event — or, sometimes, just for the pleasure of the ritual itself.

Rituals of various kinds are a feature of almost all known human societies, past or present. They include not only the various worship rites and sacraments of organized religions and cults, but also the rites of passage of certain societies, oaths of allegiance, coronations, and presidential inaugurations, marriages and funerals, school "rush" traditions and graduations, club meetings, sports events, Halloween parties, veteran parades, Christmas shopping and more. Many activities that are ostensibly performed for concrete purposes, such as jury trials, execution of criminals, and scientific symposia, are loaded with purely symbolic actions prescribed by regulations or tradition, and thus partly ritualistic in nature. Even common actions like hand-shaking and saying hello are rituals.