This is the 7110th most frequent Korean word.
제목을
"Title" or "heading."
In this sentence, '제목을' is used as the object of the verb '알다' (to know), indicating the title being referred to.
이 책의 제목을 알고 싶어요.
I want to know the title of this book.
Here, '제목을' is the object of the verb '정하다' (to decide), describing the title being selected or set.
새로운 글의 제목을 정하고 있었습니다.
I was deciding on the title of the new article.
In this case, '제목을' serves as the object of the verb '선택하다' (to choose), indicating the title being chosen or preferred.