It can be used in different ways:
* To describe something as being of French origin:
* "Un vin de français" (a French wine)
* "Une musique de français" (French music)
* To refer to someone who is French:
* "Une femme de français" (a French woman)
* "Un homme de français" (a French man)
* To indicate a language or culture:
* "Parler de français" (to speak French)
* "La culture de français" (French culture)
It's important to note that "de français" is usually followed by a noun or a pronoun. You wouldn't use it alone.