An option is a contract. It gives the owner the right, but not the obligation, to buy or sell an underlying asset at a set price on or before a specific date. The asset is typically a stock, but it can also be an index, a commodity, or a currency.

Think of it like putting a deposit on a house. You pay a small fee to lock in the purchase price for a certain period. If you decide to buy, you exercise your right. If you change your mind, you only lose the deposit. You aren't forced to buy the house.

This “right, not obligation” feature is what makes options unique. It offers flexibility. Investors use options for two main reasons:

1. Hedging: To protect their existing investments against potential losses. It's like buying insurance for your portfolio.
2. Speculation: To bet on the future direction of an asset's price with less capital than it would take to buy the asset outright.

Every options contract is defined by a few key terms. Understanding them is essential to grasping how options work.

The strike price is fixed for the life of the option.

After this date, the option is worthless.

The premium is the maximum amount of money the option buyer can lose.

Options come in two basic types: calls and puts. They are mirror images of each other. What one does for a rising market, the other does for a falling one.

Let's look at each one.

Call Options A call option gives the holder the right to buy an asset at the strike price. A trader buys a call when they believe the price of the underlying asset will increase. If the price rises above the strike price, the buyer can exercise the option to buy the asset at a discount and then sell it at the higher market price for a profit. If the price stays below the strike price, they can let the option expire and lose only the premium they paid.

Put Options A put option gives the holder the right to sell an asset at the strike price. A trader buys a put when they expect the price of the asset to fall. If the market price drops below the strike price, the put owner can buy the asset at the lower market price and then exercise their option to sell it at the higher strike price, making a profit. If the price stays above the strike price, the option expires worthless, and the loss is limited to the premium.

For every option buyer, there must be a seller. The seller, also called the writer, receives the premium from the buyer. In exchange, the seller takes on the obligation to fulfil the contract if the buyer chooses to exercise it.

• Call Seller: Obligated to sell the asset at the strike price.
• Put Seller: Obligated to buy the asset at the strike price.

This creates a balance of risk and reward. The buyer's risk is limited to the premium paid, but their potential profit can be substantial. The seller's profit is limited to the premium received, but their potential risk can be significant, especially if they don't own the underlying asset.

This table summarises the basic positions in options trading. It's a simplified view, but it captures the core mechanics of how buyers and sellers interact in the options market.

These are the fundamentals of options. Understanding these core concepts is the first step before exploring how they can be used in different trading strategies.