This is the 61st most frequent Korean word.
를
를 is a Korean object particle indicating the direct object of a verb.
를 (in its form as '을') is used as an object particle, indicating that '책' (book) is the direct object of the verb '읽습니다' (to read).
책을 읽습니다.
I read a book.
를 (in its form as '을') is used here as an object particle, marking '영화' (movie) as the direct object of '보고 싶어요' (want to watch).
영화를 보고 싶어요.
I want to watch a movie.
를 (in its form as '을') highlights '과일' (fruit) as the object receiving the verb '좋아해요' (to like).