An option gives the buyer the right but not the obligation to buy or sell a security at a specified price. A CALL option gives the buyer the right to buy a stock at a specified price. A PUT option gives the buyer the right to sell a stock at the option price. A CALL is a bet on rising prices while a PUT is a bet on more losses.
For example, let’s say you buy a CALL option on Apple (APPL) at 130 dollars. The current price of the stock is at $105.97. On the picture below we can see the option chain for AAPL stock with an expiry in June, about 57 days from today. Note that the bid/ask spread for this particular option is 0.08/0.10 (the highlighted part).
Buying this option would cost you only 10 cents. But note the second percentage column, it gives you an approximate probability of your options expiring ‘Out of the Money’. In layman terms, this means that according to the option pricing model, you have a 98.18% of getting 0 at …