Call
An options contract that gives the buyer the right, but not the obligation, to buy the underlying asset at the strike price before expiration.
Explanation
Call options increase in value as the underlying asset rises. Buyers pay a premium for the right to buy, while sellers (writers) collect the premium and accept the obligation to sell if assigned. Calls are used for bullish strategies, income generation (covered calls), and hedging short positions.
Example
Buying a $150 call on AAPL for $5.00 gives you the right to buy 100 shares at $150 until expiration. If AAPL goes to $160, the call is worth at least $10.