"가사" refers to the lyrics of a song, which are the words that convey the song's message, emotions, and themes. These lyrics can vary widely in style and content, ranging from simple and catchy phrases to complex poetic expressions. They play a crucial role in music, as they help listeners connect with the song on a deeper level. In the context of K-pop, for example, "가사" often reflects personal experiences, societal issues, or romantic themes. The lyrics are typically written in Korean, and they can be accompanied by various musical genres, enhancing the overall impact of the song.