A stock market or equity market is a public market for the trading of company stock (shares) and derivatives at an decided price.
The stock market is one of the most significant source for companies to increase money. With this businesses can be traded publicly, or raise additional capital for expansion by selling shares of ownership of the company in a public market.
The size of the world stock market was estimated at about $36.6 trillion USD at the beginning of October 2008.
The stocks are listed and traded on stock exchanges which are entities of a corporation or mutual organization specialized in the business of bringing buyers and sellers of the organizations to a listing of stocks and securities together.