This is the 186th most frequent Korean word.
많다
To be many or much.
Here, '많다' is used to describe the quantity of something existing in a place.
도서관에 책이 많다.
There are many books in the library.
Here, '많다' expresses the amount or volume of personal responsibilities or tasks.
나는 해야 할 일이 많다.
I have a lot of work to do.
Here, '많다' is used to show a large presence of people in a specific location.