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A pronoun is a word that takes the place of a noun. Examples:

I, me, he, she, herself, you, it, that, they, each, few, many, who, whoever, whose, someone, everybody, etc.
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In English, there are 7 types of pronouns:

Personal pronouns:
Subject pronouns (I, you, he, she, it, we, you, they)
Object pronouns (me, you, him, her, it, us, you, them)
Possessive pronouns (mine, yours, his, hers, its, ours, yours, theirs)
Demonstrative pronouns (this, these, that, those)
Interrogative pronouns (who, whom, which, what)
Relative pronouns (who, whom, that, which, whoever, whichever, whomever)
Indefinite pronouns (all, another, any, anybody, anyone, anything, each, everybody, everyone, everything, few, many, nobody, none, one, several, some, somebody, and someone)
Reflexive pronouns (myself, yourself, himself, herself, ourselves, yourselves, themselves)
Intensive pronouns (myself, yourself, himself, herself, ourselves, yourselves, themselves)

i see quite a few books with just MY in the title.