Personal property left by an owner who intentionally relinquishes all rights to its control. Real property may not be abandoned. See Adverse Possession.
At common law, a person who finds abandoned property may claim it. To do so, the finder must take definite steps to show their claim. For example, a finder might claim an abandoned piece of furniture by taking it to her house, or putting a sign on it indicating her ownership.
Many jurisdictions have statutes that modify the common law's treatment of lost or abandoned property.

