This is the 769th most frequent French word.
françaises
The feminine plural form of "French."
In this context, 'françaises' is an adjective used to describe customs ('coutumes'), attributing them to French culture.
Les coutumes françaises varient d'une région à l'autre.
The French customs vary from one region to another.
Here, 'françaises' is an adjective used to characterize songs ('chansons'), denoting their French origin.
Nous aimons les chansons françaises des années 80.
We love the French songs from the 80s.
Here, 'françaises' is an adjective describing a group of female students ('étudiantes') and specifies their French nationality.