The meaning of pronouns.

Words like he, she and it which are used instead of the nouns boy, girl and pigeon are pronouns.
A pronoun is used insted of a noun.
Other pronouns are his, him, her, its, I, you, your, they, them, their, my, mine and me.

instead of boy, the word 'He' is used.
instead of girl, the word 'She' is used.
instead of pigeon, the word 'It' is used.

This is a boy. He is running.	This is a girl. She is sitting.	This is a piegon. It is eating