「出る」 (deru) means "to leave" or "to exit" from a place. It's an intransitive verb. You can use the particle "を" to show the place you are exiting, or "から" to indicate the starting point of leaving. For example, leaving a house or company.

「出る」は、場所から外へ行く動詞です。「家を 出る」のように使います。