It is often used to describe objects that move horizontally, like:
* Sliding doors (portes coulissantes)
* Sliding windows (fenêtres coulissantes)
* Sliding drawers (tiroirs coulissants)
It can also be used in a more metaphorical sense, for example:
* A sliding scale (une échelle glissante)
* A sliding payment (un paiement glissant)
The word is derived from the verb "coulisser", which means "to slide".