nse & bse..

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Can any one able to give me more details about "NSE" & "BSE". I know that : NSE-National Stock Exchange, BSE-Bombay Stock Exchange We can able to Buy and Trade Stocks and shares through both of the Exchanges. But i cannot find some of the Stocks which was available in the BSE is not available in NSE.. I have a doubt that Why we have Two Exchanges for Buying and Selling of Shares..?? Is there any reason..?? Plese explain me about that..