「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(で)る」は、場所(ばしょ)から外(そと)へ行(い)く動詞(どうし)です。「家(いえ)を 出(で)る」のように使(つか)います。