The policy of active participation or engagement in a particular sphere of activity; spec. the use of vigorous campaigning to bring about political or social change.
Activism is the practice of taking action to promote, resist, or demand change in social, political, economic, or environmental systems. It includes everything from protests and community organizing to education, creative work, and policy advocacy. At its core, activism is rooted in the belief that the world can be made more just, equitable, and humane.