What does a traditional restaurant mean?
does it mean like a french restaurant, italian, mexican, etc?
or is it something else? ?

Explanation:

A traditional restaurant consists of your menu's design, service style, dining room decor, and — of course — the style of food. Traditional Restaurant's are places that don't have high or low standards. Such as ( McDonald's Wendy's etc.). Hope this helps.

Bonjour

In French a traditional restaurant means un restaurant traditionnel

The adjective "traditionnel" comes from the noun "tradition"

so "un restaurant traditionnel" in France will serve traditional food from France.

It doesn't include Mexican, Italian, Chinese .. food nor fast food..

They will serve typical food from parts of  (régions) France.

Hope this helps ☺☺☺