Stock is a matter of identity where as the stock Market is the place where buyers and sellers gets connected , primary market helps in promotion to initiate IPO , secondary Market is the stock market to exchange and transfer the shares Face value is just the denominations , profit shared back to people is dividend
Nifty – average performance of top 50 companies in NSE
Sensex – Average performance of top 30 companies in BSE
Nifty and sensex both are just Index