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.
There are many different forms of activism; a select list follows.
... the advent of digital television in the UK, satellite viewers were able to view the service.
The BBC were initially criticized for the cost of running BBC News 24 ...