A lock-in period is a defined duration during which an investor is contractually or regulatory restricted from redeeming, selling, or transferring their investment in a financial instrument — including mutual fund units, fixed deposits, insurance policies, IPO allotments (for anchor investors and promoters), ELSS funds, NPS contributions, and sovereign gold bonds. Lock-in periods are designed to encourage long-term investment behaviour, ensure capital stability for the fund or issuer, and align investor and investee interests. In India, notable lock-in periods include three years for ELSS mutual funds (eligible for Section 80C tax deduction), six months for anchor investors in IPOs, and three years for pre-IPO shares held by promoters post-listing. For investors on Ventura Securities, understanding the lock-in terms of every investment product before committing capital is essential — lock-in restrictions can significantly impact liquidity planning, portfolio rebalancing flexibility, and the ability to respond to changing financial circumstances or market conditions.