It is a very important verb in French, just like it is in English. It is used in many different ways, such as:
* To describe someone or something: "Je suis fatigué" (I am tired).
* To indicate location: "Le livre est sur la table" (The book is on the table).
* To express possession: "C'est mon livre" (It is my book).
* To form the passive voice: "Le château a été construit en 1500" (The castle was built in 1500).
"Être" is also conjugated in different ways depending on the subject and tense.
Let me know if you'd like examples of conjugations or want to know more about how "être" is used in French!