Stock Index Future: Underlying is any stock index. Like Nifty Future with different expiry dates. For Indian capital market the expiry date lies on the last Thursday of a month and any previous working day for any holiday on that particular day. Three future contracts are traded the most with three immediate expiry dates.
Stock Future: Underlying is any stock. Like Infosys, TCS, Reliance Industries Ltd all are having their own future contracts trading on Nifty with different settlement dates. They are also having the future contracts with three immediate expiry dates.
Currency Future: Underlying is the currency exchange rate. This is also traded on exchanges.
Commodities Future: Underlying is different commodities like Gold, Crude Oil, Pulses, and Silver etc.