Domestic extremism refers to the activity of individuals or groups conducting criminal acts of direct action to further their protest campaign. This term covers the conduct of groups involved including the extreme right wing and animal rights extremists.
Violent extremism refers to the activity of individuals or groups conducting acts by any means to express views which justify or glorify terrorist violence. This includes those that encourage others to commit terrorist acts or provoke others into terrorist related activity. It also includes those whom foster hatred which may lead to inter-community tensions and violence within the United Kingdom.
Radicalisation is the process where a vulnerable young person or adult changes their perception and beliefs due to exposure of an extremist influence (which may be online, publication or one to one direct contact) to become more extremist in nature which may result in extremist actions.