Violence is deliberate behaviour resulting in physical injury to other human beings, or more broadly to other animals as well, and is often, but not necessarily, associated with aggression. Some forms of violence are socially and legally sanctioned, others are crimes. Different societies apply different standards relating to approved and non-approved forms of violence.
Forms of violence include:
also see http://www.violence.de for more information about James W. Prescott's work.
Cruelty is unethical violence, also psychological kinds.