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 Connecticut, assault is defined under various degrees with specific statutes outlining the elements and penalties for each. The basic form of assault, often referred to as simple assault, is covered under Connecticut General Statutes § 53a-61, which defines Assault in the Third Degree. This occurs when an individual, with intent to cause physical injury to another person, causes such injury to such person or a third person, or with criminal negligence, causes physical injury to another person by means of a deadly weapon, a dangerous instrument, or an electronic defense weapon. Assault with a deadly weapon, known in Connecticut as Assault in the First Degree, is a more serious offense and is covered under § 53a-59. This statute states that a person is guilty of Assault in the First Degree when, with intent to cause serious physical injury to another person, they cause such injury to such person or a third person by means of a deadly weapon or a dangerous instrument. Assault in the First Degree is considered a felony in Connecticut and carries severe penalties, including imprisonment. It's important to note that the mere attempt or threat, with the apparent ability to carry it out, may constitute assault even without physical contact, while the actual physical contact may lead to battery charges, which are distinct from assault charges in Connecticut.