Profit booking refers to the deliberate act of selling a security — equity share, futures contract, or option — by an investor or trader to realise accumulated unrealised gains, converting paper profits into actual cash returns in the portfolio. Profit booking is a natural and rational investment behaviour — after a significant price appreciation, early investors and short-term traders sell their holdings to lock in returns, creating selling pressure that can temporarily pause or reverse a price rally. The term is widely used in Indian financial media and market commentary — 'profit booking at higher levels' is a commonly cited explanation for intraday price pullbacks following gap-up openings or sharp single-session rallies in Nifty 50 or individual stocks. Profit booking is distinct from panic selling (driven by fear of losses) and from fundamental deterioration-driven selling — it reflects rational risk management by investors who have achieved their target returns or wish to rebalance their portfolio. In F&O markets, profit booking on long futures or long options positions involves squaring off the position before expiry rather than holding to settlement, particularly when the target profit level has been achieved ahead of the expected timeline.