Excerpt
What an option is The difference between a commodity, a futures contract, and an options contract is illustrated in the following three paragraphs, which will take you 1 1/2 minutes to read.
Suppose you're in the market for an oriental rug. You find the rug of your choice at a local shop, you pay the shopkeeper $500, and he transfers the rug to you. You have just traded a commodity.
Suppose instead you wish to own the rug, but you prefer to purchase it in one week's time. You may be on your way to the airport, or maybe you need the short-term use of your money. You and the shopkeeper agree, verbally or in writing, to exchange the same rug for $500 one week from now. You have just traded a futures contract.
Alternatively, you may like the rug on offer, but you may want to shop around before making a final decision. You ask the shopkeeper if he will hold the rug in reserve for you for one week. He replies that your proposal will deny him the opportunity of selling the rug, and as compensation, he asks that you pay him $10. You and the shopkeeper agree, verbally or in writing, that for a fee of $10 he will hold the rug for you for one week, and that at any time during the week you may purchase the same rug for a cost of $500, excluding the $10 cost of your agreement. You, on the other hand, are under no obligation to buy the rug. You have just traded an options contract.