When is a tilde used. I know used over the n in Spanish language but need to what e French language.?

You are correct, the tilde (~) is used over the "n" in Spanish to indicate that the "n" should be pronounced with a nasal sound, similar to the "ng" sound in English.

In French, the tilde is not used to indicate a nasal sound. The circumflex accent (^) is used instead.

For example:

* Spanish: "año" (year) - the "ñ" is pronounced with a nasal sound

* French: "âne" (donkey) - the "â" is pronounced with a nasal sound

However, there are some rare instances where the tilde might be used in French.

* Mathematical notations: It is often used in mathematical equations to represent an approximate value.

* Computer science: It can be used in URLs and filenames, but it's not a standard feature in the French language.

Overall, the tilde is not a standard feature of the French language. You will primarily encounter the circumflex accent for nasal sounds.