Pronouns in English replace nouns to avoid repetition and simplify sentences. They include subject pronouns (I, you, he, she, it, we, they), object pronouns (me, you, him, her, it, us, them), possessive pronouns (mine, yours, his, hers, its, ours, theirs), and reflexive pronouns (myself, yourself, himself, herself, itself, ourselves, yourselves, themselves)