I grabbed the definition from the dictionary.
“the use of violent action in order to achieve political aims or to force a government to act” – Oxford dictionary
“ The use of violence or the threat of violence, especially against civilians, in the pursuit of political goals.” – the American heritage
“ the unlawful use of violence or threats to intimidate or coerce a civilian population or government, with the goal of furthering political, social, or ideological objectives” – dictionary dot com