Think of an option contract like a coupon for a big-ticket item, say, a new laptop. You might pay $10 for a coupon that gives you the right to buy that $1,000 laptop for a fixed price of $950 anytime in the next month. If the laptop's price jumps to $1,200, your coupon is incredibly valuable. You can buy the laptop for $950 and save a lot. If the price drops to $800, your coupon is useless, and you've only lost the $10 you paid for it. You're not forced to buy the laptop.

In the world of finance, that “underlying asset” is usually 100 shares of a stock. The person who buys the option is the holder, and the person who sells it is the writer. The holder pays a fee for the rights the contract provides, while the writer receives that fee for taking on an obligation.

To understand options, you need to know a few key terms. These are the building blocks of every option contract.

There's an opposite to a call.

Every option contract specifies a price and a date.

Finally, these rights aren't free. The price you pay for an option contract is called the premium.

The premium of an option isn't arbitrary. It's determined by several factors, which can be grouped into two types of value: intrinsic and extrinsic.

Intrinsic value is the amount by which an option is “in the money.” It’s the direct, tangible value you’d get if you exercised the option right now. An option can't have negative intrinsic value; it's either positive or zero.

For a call option, intrinsic value is the stock price minus the strike price. If a stock is trading at $55 and you hold a call option with a $50 strike price, your option has $5 of intrinsic value per share.

For a put option, it's the strike price minus the stock price. If you have a put with a $40 strike price and the stock is trading at $37, it has $3 of intrinsic value per share.

Extrinsic value is everything else. It's the part of the premium that reflects the possibility of the option becoming more valuable in the future. It's often called “time value.”

Two main components drive extrinsic value:

1. Time to Expiration: The more time an option has until it expires, the more chances the stock price has to move favorably. An option expiring in six months will have a higher extrinsic value than one expiring next week, all else being equal.
2. Implied Volatility: This reflects how much the market expects the stock's price to fluctuate. A stock that swings wildly is considered more volatile. Higher volatility means there's a greater chance of a big price move, which increases an option's extrinsic value.

Understanding these basic components is the first step. They are the foundation for every strategy and decision you'll make in options trading.