Protest: A protest is an expression of bearing witness on behalf of an express cause by words or actions with regard to particular events, policies or situations. Protests can take many different forms, from individual statements to mass demonstrations.
Civil Disobedience: Civil disobedience is the active refusal to obey certain laws, demands and commands of a government without resorting to physical violence. It's like refusing to do your chores as a way to protest against unfair rules at home.
Activism: Activism consists of efforts to promote, impede, direct, or intervene in social, political, economic, or environmental reform with the desire to make changes in society. It's like being the captain of your school's debate team - you're actively working towards making change happen.