An option gives you the right — but not the obligation — to buy or sell an asset at a set price (strike price) by a specific date (expiration). A call option gives the right to buy; a put option gives the right to sell. You pay a premium for this right. If the trade does not work out, you just lose the premium — not more.
Example: You buy a call option on Apple at a $200 strike price for a $5 premium. If Apple rises to $220, your option is worth $20 — a 300% return on your $5 investment. If Apple stays below $200, the option expires worthless and you lose only the $5 premium. This asymmetric payoff (limited downside, unlimited upside) makes options powerful.
India's NSE is the world's largest derivatives exchange by contract volume. Options trading has exploded — NSE traded 108 billion contracts in 2023. The Black-Scholes model (Nobel Prize 1997) is the standard for options pricing. Key Greeks: Delta (price sensitivity), Theta (time decay), Vega (volatility sensitivity), and Gamma (delta's rate of change).