Alibi defence asserts the accused was elsewhere, challenging the prosecution's claim of presence at the crime scene. Alibi is a substantive criminal-law concept defined as 'elsewhere; in another place.' As a fact-based defense, an alibi asserts the accused was not at the location of the alleged offense and relies on evidence and testimony to corroborate the defendant's asserted location at the relevant time, thereby contesting the prosecution's claim of presence at the scene.