THE STOCK MARKET IS A VIRTUAL PLACE WHERE SHARES ARE BOUGHT AND SOLD .SHARES ARE ISSUED IN THE PRIMARY MARKET BY THE COMPANIES TO BUILD THE CAPITAL .THEN THE SHARES ARE TRADED IN THE SECONDARY MARKET AMONG THE SHAREHOLDERS THROUGH STOCK EXCHANGES WHICH ARE CONTROLLED BY SEBI.MEASURE OF THE STOCK MARKET IS BY USING INDICES .MOST POPULAR TWO INDICES ARE NIFTY AND SENSEX.