Burglary is an unlawful entry into a building for the purposes of committing an offence. Usually that offence is theft, but most jurisdictions include others within the ambit of burglary. To engage in the act of burglary is to burgle or to burglarize. Burglary is usually defined as the illegal entry into almost any structure with the intent to commit any crime inside. No physical breaking and entering is required; the offender may simply trespass through an open door.