Why do we say restez and utilisez

Question

I know I've covered this at sometime but can't remember why we add ez on words that don't have vous in front of it.  Please remind me.

Accepted Answer

Sue, 
 
In this context, restez and utilisez are in present imperative form in 2nd person, formal or plural. 
As in English, in French neither the subject pronoun nor a stress pronoun is included in a standard imperative, direction or ‘polite’ command.
https://progress.lawlessfrench.com/revision/grammar/conjugate-regular-verbs-in-l-imperatif-imperative
 https://progress.lawlessfrench.com/revision/glossary/conjugation-tense-mood-aspect/french-imperative-tense-l-imperatif-present
 https://progress.lawlessfrench.com/revision/glossary/conjugation-tense-mood-aspect/english-present-imperative 
(The 3 links are different, although all showing same title when I submit the response)