Money Market

What is Money Market? I know about money and know also about market. But if these two words become one, is mean same? Money for buying daily. Market is place where we can get something with buying.

So, money market is place for buying money? Or what? Buying money with money? How can? Or its mean converter? Buy money with another country money?

Oh my God, don't make me confuse, please someone, tell me about money market!