맞습니다 [ matseumnida ]
The above is a polite form of 맞다 ([matda], which means that is correct).
This can be used when you want to say that you agree with what a person has said.
The meaning of 맞다 is somewhat similar to right or good; it is used to mean something fits well, matches, harmonizes, or is appropriate.
Be careful, though: It can also have the meaning of getting beaten or hit, depending on the situation.