Pronouns take the place of a noun.

He, she, we, they, you, it, and I are pronouns. They take the place of a noun in a sentence. After you write somebody’s name, you can use pronouns to avoid repetition in the following sentences that apply to that same person or thing.

His, her, ours, their, your, its, and  my are possessive pronouns, meaning something belongs to  he, she, we, they, you, it, or  me. They are followed by the noun they own.

Examples: his car, her book, their home, its tail, my pen

Him, her, us, them, and  me are used as objects, meaning they receive an action.

Example: Tom threw the football to him.

Who, what, and which are also pronouns used in questions. (You don’t know the name of the noun.)

Examples: Who is at the door? What day is it today? Which book are you reading?

Here’s a video to help you out: