Which crime is defined as the willful and unlawful use of force or violence against another person?

The crime defined as the willful and unlawful use of force or violence against another person is battery. In California Penal Code, battery refers specifically to the act of intentionally causing bodily harm to someone else. This involves any form of harmful or offensive contact, which can include physical force against another without their consent. It emphasizes the intentionality behind the action, underscoring that the act is both willful and unlawful.

In contrast to other options, assault, while it involves the threat or attempt to inflict harm, does not require actual physical contact. Carjacking involves the theft of a vehicle using force or intimidation but is not about interpersonal violence in the same way as battery. Lastly, false imprisonment refers to the unlawful restraint of an individual against their will, which does not necessarily entail the use of force or violence. Thus, battery is the most accurate definition fitting the provided description.