The possessive personal pronouns are the words mine, yours, hers, his, its, ours, and theirs. Unlike possessive adjectives, which modify something, possessive personal pronouns stand alone. For this reason, the are also known as "absolute possessives". (Note: There are no apostrophes in absolute possessives.)
Take my car and leave yours.
(The absolute possessive "yours" stands alone; whereas, "my" modifies "car".)
There are no apostrophes in absolute possessives.
These are her's.
What are pronouns?
The different types of pronouns
Glossary of grammatical terms
Click on the possessive personal pronoun: