Stock market is a platform where trading takes place .both buyers and sellers with the help of brokers exchange the shares and make trade. In the market initially the company provide offer to public to buy their shares .it may be the company get diversified or in need of capital.shares are open to the market with the equal value.traders generally buy and sell shares to make profit and investors will hold the share to make profit through dividend or bonus share. For such a practice stock exchange perform as a mediator to ease the operations of buying and selling.in general NSE and BSE are the stock exchange in India.they are controlled by SEBI and monitored.