Markets basically involve people buying, selling or exchanging stuff. A market can be a fixed place where buyers and sellers meet to buy and sell different things. A market can just mean buyers and sellers anywhere in the World dealing in one type of thing.
A market is any place where the sellers of a particular good or service can meet with the buyers of that goods and service where there is a potential for a transaction to take place. The buyers must have something they can offer in exchange for there to be a potential transaction.