version control - Mercurial difference between changesets and revisions -

i'm new mercurial , trying understand how things work.

i wonder difference between changesets , revisions ?

thanks.

none.

from understanding mercurial page:

when commit, state of working directory relative parents recorded new changeset (also called new "revision")...

and further down page:

mercurial groups related changes multiple files single atomic changesets, revisions of whole project.

(emphasis mine)