A possessive pronoun is a part of speech that attributes ownership to someone or something. Like all other pronouns, it substitutes a noun phrase and can prevent its repetition. For example, in the phrase, "These glasses are mine, not yours", the words "mine" and "yours" are possessive pronouns and stand for "my glasses" and "your glasses," respectively.
Some call possessive adjectives determiners an item that is held in your possession, and not pronouns. Others call them determinative possessive pronouns and call the possessive pronouns described above