What an Option Is
An option is a contract that gives the buyer the right — but not the obligation — to buy or sell an underlying asset at a predetermined price before or on a specific date. The seller, or writer, is the one who fulfills the contract if the buyer chooses to exercise. Two people make the trade: one pays for the right, and one collects the payment and takes on the obligation.
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Calls and Puts
A call option gives the buyer the right to purchase the asset at the agreed price. A put option gives the buyer the right to sell it. If you expect the price to rise, you might buy a call; if you expect it to fall, you might buy a put. Sellers write calls when they are willing to sell the asset at the strike price, and write puts when they are willing to buy it there.
The Premium and Key Terms
The buyer pays the seller a premium for the option. The strike price is the fixed price at which the trade can happen. The expiration date is the last day the option can be exercised. In the money means the option has intrinsic value because the market price is favorable compared to the strike price. Out of the money means it has no intrinsic value yet. Time value is the portion of the premium that reflects how much time remains and how volatile the asset is.
How Expiration and Exercise Work
At expiration, an in the money option can be exercised or allowed to expire. American-style options can be exercised any time before expiration; European-style options can only be exercised on the expiration date. If you buy a call with a strike price of 100 and the asset is trading at 110, you can buy it at 100 and immediately sell it at market price, pocketing the difference minus the premium you paid.
Why People Trade Options
Traders use options to speculate on direction, to hedge against price moves in a portfolio they already own, or to generate income through premium collection. Because options can be closed before expiration by selling the contract, they offer flexibility that owning the underlying asset does not. The risk and reward profile is different for buyers and writers: buyers can lose only the premium paid, while writers can face much larger losses if the market moves sharply against them.
What You Should Know Before Trading
Before trading options, understand the contract terms, the cost of the premium, and what can happen at expiration. Practice with a paper trading account to see how premiums move with the underlying price, time, and volatility. Options involve leverage, which can magnify both gains and losses, so position sizing and risk management matter just as much as the direction you expect the market to move.