Tout can be two different kinds of pronouns.
Neuter pronoun
When it's a neuter pronoun, tout is invariable and means "all" or "everything":
avant tout above all
malgré tout in spite of everything
c'est tout that's all
tout va bien everything is fine
tout est en règle everything is in order
Tout ce qui brille n'est pas or All that glitters isn't gold
Plural pronoun
As a plural pronoun, there are two forms, tous and toutes, which mean "everyone" or "all" and usually have an
antecedent.
Où sont mes amis ? Tous sont ici. Ils sont tous ici.
Where are my friends? Everyone is here. They're all here.
Je ne vois pas les filles. Elles sont parties toutes ensemble.
I don't see the girls. They all left together.
Pronunciation
The different pronouns are pronounced as follows:
tout - [tu]
tous - [tus]
toutes - [tut]
All about Tout: Introduction | Adjective | Adverb | Noun | Pronoun | Test

