Futures is used when you expect the price to move up or down and carry the position beyond intraday and you need to pay caution deposit to exchange for trading in futures market. Realisation happens every day and the profit/loss each day is termed as MTM. In Futures both buyer has the right to buy with obligation and seller has the right to sell with obligation. In options market buyer has the right with no obligation and seller has no right with obligation. Options market has call and put options.