When you trade options, you're essentially placing a bet on if a stock will decrease, increase or remain the same in value; how much it will deviate from its current price; and in what time those changes will occur. Based on those parameters, you can choose to enter into a contract to buy or sell a company's stock.
Option trading gives the buyer the right but not the obligation to buy (call option) or sell (put option) a certain underlying asset at a predetermined price within a stipulated period. Options trading involves strategies that provide traders with various market positions to make gains or mitigate the spot market risk.