Squatting is the act of occupying an abandoned or unoccupied space or building that the squatter does not own, rent or otherwise have permission to use. There may be as many as one billion squatters globally, or about one of every seven people.
Colin Ward states that "Squatting is the oldest mode of tenure in the world, and we are all descended from squatters. This is as true of the Queen [of the UK] with her 176,000 acres as it is of the 54 per cent of householders in Britain who are owner-occupiers. They are all the ultimate recipients of stolen land, for to regard our planet as a commodity offends every conceivable principle of natural rights."
Besides being residences, some squats are used as social centres or host give-away shops, pirate radio stations and cafés.