The crime of assault varies from state to state (and under federal law), but is generally defined as intentionally putting another person in reasonable apprehension or fear of an imminent (immediate) harmful or offensive contact. The crime of assault may be committed even if there is no physical contact, as the criminal physical contact constitutes the separate crime of battery.

The crime of assault with a deadly weapon (also known as aggravated assault) occurs when someone uses a deadly weapon (gun, knife, club, tire iron, brass knuckles, etc.) during an assault.

In Arizona, assault is defined under Arizona Revised Statutes (ARS) §13-1203. It is considered assault when a person intentionally, knowingly, or recklessly causes any physical injury to another person; or intentionally places another person in reasonable apprehension of imminent physical injury; or knowingly touches another person with the intent to injure, insult, or provoke such person. The crime of assault can occur without physical contact. Aggravated assault, which includes assault with a deadly weapon or dangerous instrument, is a more serious offense and is defined under ARS §13-1204. This occurs when a person commits assault as defined by ARS §13-1203 and also uses a deadly weapon or dangerous instrument, or commits the assault after entering the private home of another with the intent to commit assault, or if the assault results in serious physical injury, among other circumstances. Aggravated assault is typically charged as a felony, with penalties varying based on the specific circumstances and the presence of any aggravating factors.