Activism, in a general sense, can be described as involvement in action to bring about change, be it social, political, environmental, or other change. This action is in support of or opposition to one side of a controversial argument.

In contemporary use, "activism" tends to be a word associated with the actions and ideologies of those on the political left.

There are many different forms of activism; a select list follows.

Voluntary simplicity
Civil disobedience
Civil and social disobedience
Animal rights activism
Anticonsumerist activism
Anti-corporate activism
Anti-racist activism
Economic activism
Environmental activism
Fair trade
Culture jamming
Tactical Frivolity
Guerrilla communication

See also: direct action