Option premium is the price paid to purchase an option contract, representing the cost of obtaining the right (but not obligation) to buy or sell an underlying asset. Premium consists of intrinsic value (amount in-the-money) and time value (potential for future profit). Option premiums fluctuate based on underlying price, volatility, time decay, and interest rates.

Option premium pricing involves complex mathematical models considering multiple variables including the Black-Scholes model for European options. Understanding premium components helps traders assess option value and select appropriate strategies. High premiums may indicate expensive options, while low premiums might suggest limited profit potential or high probability of loss.

Real-world example: A Tesla call option with $250 strike trading at $15 premium when Tesla is at $260 contains $10 intrinsic value and $5 time value, with the premium declining as expiration approaches if Tesla remains at current levels.