Hi, Ethan Justine! Answer for your question: 을/를 is the object particle. And it's added to a noun to express that the noun is the object of the sentence. For example, 유진이가 음악을 들어요 (=Yoojin listens to music). Here, 을 is added to the noun '음악' which shows that '음악' is the object of the sentence. If the noun ends in a vowel, 를 is added, and if the noun ends in a consonant, 을 is added. In Korean language, the particle plays the important role to identify subject, object, or adverbials in the sentence. Does it help you? :)
It's comprehensive. I appreciate kind teaching. Thank you, 선생님.