It is used to refer to all individual members of a group or set, indicating that something applies to each one.
Here are some examples:
* Chaque jour: Every day
* Chaque personne: Each person
* Chaque livre: Every book
* Chaque enfant: Each child
"Chaque" is often used with a singular noun, but it can also be used with a plural noun when referring to individual units within the group. For example:
* Chaque groupe de personnes: Each group of people
* Chaque paquet de biscuits: Every packet of biscuits
It's important to note that "chaque" is often followed by a singular noun, even if the noun is referring to a group of people or things.