This is the 429th most frequent Japanese word.
出る
"To go out," "to come out," or "to appear."
Here, "出る" signifies 'to exit' or 'to leave' in terms of physical space.
彼は部屋から出た。
He left the room.
In this sentence, "出る" is used to mean 'to appear' or 'to perform' on stage, showing presence at an event.
舞台に出るのが彼女の夢です。
Her dream is to perform on stage.
Here, "出る" indicates 'to be published' or 'to appear' in a publication or similar medium.