In option trading, risk and reward are related to the likelihood of the option expiring in the money and the amount of profit or loss that will result.

The risk in option trading is the potential loss of the premium paid for the option. When you buy an option, you pay a premium to the seller for the right to buy or sell the underlying asset at a predetermined price. If the option expires out of the money, meaning it is not profitable to exercise the option, the premium is lost.

The reward in option trading is the potential profit that can be made if the option expires in the money. If the option is exercised and the underlying asset is sold at a price higher than the strike price (for a call option) or bought at a price lower than the strike price (for a put option), the holder of the option can profit.

The risk and reward in option trading can be affected by a number of factors, including the volatility of the underlying asset, the time remaining until the option expires, and the strike price of the option relative to the current market price of the underlying asset.