The Nifty and the Sensex are both indices.
The Sensex, also known as the BSE 30, is a stock market index comprising 30 well-established and financially sound companies listed on the Bombay Stock Exchange (BSE). Similarly, the Nifty is an indicator of the 50 top major companies on the National Stock Exchange (NSE).
Sensex and Nifty serve as indicators of market movement. If the Sensex or Nifty rises, it signifies that the majority of stocks in India experienced an increase during the given period. Conversely, a decline in the Nifty indicates that the stock prices of most major stocks on the BSE have fallen.
Nifty Futures represent a type of index futures with the underlying asset being the S&P CNX Nifty index. Nifty Futures Contracts come with three expiration dates: the near month, mid-month, and far month. The expiration day for each contract is the last Thursday of every month. Nifty Futures are among the most actively traded contracts in India.