It's a very important verb in French, just like "to be" is in English. It's used in many different ways, such as:
* Describing someone or something: "Je suis grand" (I am tall)
* Expressing a state of being: "Elle est malade" (She is sick)
* Forming the passive voice: "Le livre a été écrit par un auteur célèbre" (The book was written by a famous author)
Let me know if you have any other French words you want translated!