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What are Options?

An option is a contract to buy or sell a specific financial product officially known as the option's underlying instrument or underlying interest. For equity options, the underlying instrument is a stock, exchange-traded fund (ETF), or similar product. The contract itself is very precise. It establishes a specific price, called the strike price, at which the contract may be exercised, or acted on. And it has an expiration date. When an option expires, it no longer has value and no longer exists.

Options come in two varieties, calls and puts, and you can buy or sell either type. You make those choices - whether to buy or sell and whether to choose a call or a put - based on what you want to achieve as an options investor.

Buying and Selling
If you buy a call, you have the right to buy the underlying instrument at the strike price on or before the expiration date. If you buy a put, you have the right to sell the underlying instrument on or before expiration. In either case, as the option holder, you also have the right to sell the option to another buyer during its term or to let it expire worthless.

The situation is different if you write, or "sell to open", an option. Selling to open a short option position obligates you, the writer, to fulfill your side of the contract if the holder wishes to exercise. When you sell a call as an opening transaction, you're obligated to sell the underlying interest at the strike price, if you're assigned. When you sell a put as an opening transaction, you're obligated to buy the underlying interest, if assigned. As a writer, you have no control over whether or not a contract is exercised, and you need to recognize that exercise is always possible at any time until the expiration date. But just as the buyer can sell an option back into the market rather than exercising it, as a writer you can purchase an offsetting contract, provided you have not been assigned, and end your obligation to meet the terms of the contract. When offsetting a short option position, you would enter a "buy to close" transaction.