Ownership is the ultimate and exclusive right (subject to certain restrictions) to enjoy, occupy, possess, rent, sell (fully or partially), use, give away, or even destroy an item of property. Ownership may be 'corporeal' (title to a tangible object such as a house) or 'incorporeal' (title to an intangible something, such as a copyright, or a right to recover debt).
Although many people are not aware of this, “possession” (as in tenancy or loan) does not necessarily mean ownership because it does not automatically transfer title.
One can possess something without being the owner of this item, through loan, rent, right of use.
A property can be acquired by purchase, by inheritance, or even by usucapio or acquisitive prescription.
¿But what happens in case two persons claim ownership of the same item?