Appropriation is a process by which previously unowned natural resources, particularly land, become the property of a person or group of persons. The term is widely used in economics in this sense. In certain cases, it proceeds under very specifically defined forms, such as driving stakes or other such markers into the land claimed, which form gave rise to the term “staking a claim.” "Squatter’s rights" are another form of appropriation, but are usually asserted against land to which ownership rights of another party have been recognized. In legal regimes recognizing such acquisition of property, the ownership of duly appropriated holdings enjoys such protections as the law provides for ownership of property in general.