Exchanges have two clienteles: companies, which list their shares, and investors, who trade on the exchange.

How may stock exchanges in the world.

http://www.creditworthy.com/providers/stock.asp?ID=30

Federation of Euro-Asian Stock Exchanges was created in 1995.

Yes, there are many 'Stock Exchanges' in the world. e.g. Dow Jones (Wall Street), Australian Stock Exchange (ASX), London Stock Exchange (FTSE).

There is pretty much a stock exchange in almost every country in the world.