How do you say it is an appetiser in french?

"It is an appetizer" in French can be said in two ways, depending on the context:

Formal:

* C'est un hors-d'œuvre. (This is a literal translation of "hors d'oeuvre")

Informal:

* C'est une entrée. (This translates to "entrée" which is more commonly used in French for appetizer)

You can also use the more casual phrase:

* C'est un amuse-gueule. (This translates to "mouth-watering" and is often used for small, light appetizers)