Money Market : Its a Global financial market for short term borrowing and lending. The money market is where short-term obligations such as treasury bills commercial paper and banker'sacceptances are bought and sold.
Just like goods and services are sold in market money itself is also sold.
That does not mean foreign currency. I mean when you buy short term deposit treasury bill of government commercial paper etc then it is called money market.
Here you are buying money and giving money in the same currency.
Profit is when you get more currency and give fewer currency to obtain it.