A commodity market is a market that trades in primary economic sector rather manufactured products.  Soft commodities are agriculture products such as Wheat, coffee, sugar and cocoa. Hard commodities are mined products such as gold and oil. Future contracts are the oldest way of investing in commodities. Futures are secured by physical assets. Commodity market can includes physical trading in derivatives using spot prices, forwards, futures and options on futures. Collectively all these are called Derivatives.
Commodity futures used by companies give a hedge to the risk of adverse price movements. The goal of hedging is to prevent losses from potentially unfavorable price changes rather than to speculate. Many companies that hedge use or producing the underlying asset of a futures contract. Examples of commodities hedging use include farmers, oil producers, livestock breeders, manufacturers, and many others.
The Problem arises if one party fails to perform. The trader may fail to sell if the prices of steel goes very high like for example INR 40,000 in January 2017, in that case, he may not be able to sell at INR 31,000. On the other hand, if the buyer goes bankrupt or if the price of steel in January 2017 goes down to INR 20,000 there is an incentive to default. In other words, whichever way the price moves, both the buyer and seller have an incentive to default.
A call option is a contract that gives the investor the right to buy a certain amount of shares (typically 100 per contract) of a certain security or commodity at a specified price over a certain amount of time. For example, a call option would allow a trader to buy a certain amount of shares of either stocks, bonds, or even other instruments like ETFs or indexes at a future time (by the expiration of the contract).