We use indefinite pronouns to refer to people or things without saying exactly who or what they are. Pronouns ending in -body or -one refer to people, and pronouns ending in -thing refer to things.
For example:
anybody
anyone
anything
everybody
everyone
everything
nobody
no one
nothing
somebody
someone
something
Everybody is at the party.
Everybody is at the party. They arrived early to help decorate.
No one else came to the party. He was all alone.
Someone’s car was robbed.