indefinite pronoun A pronoun that does not refer to a particular person or object, such as all, anybody, anywhere, each, enough, every, everyone, everything, one, somebody, something, either, more, most, neither, none, and nobody.
personal pronoun A pronoun that refers to a specific person or object and changes form depending on its function in a sentence, such as I, me, my, we, us, and our.
The possessive forms of personal pronouns, however, do not have apostrophes: my, mine, your, yours, hers, his, its, our, ours, their, theirs.