Systematic Investment Plan (SIP) is a method of investing in a systematic and disciplined manner usually in mutual funds. Under an SIP, investors invest a fixed amount of money at regular intervals (usually monthly) into a mutual fund scheme. SIP allows investors to invest in a disciplined way without having to time the market. It helps to average out the purchase cost of mutual fund units over time, reducing the impact of market volatility on the investment. By investing a fixed amount at regular intervals, investors can purchase more units when the price is low and fewer units when the price is high, averaging out the cost of investment. Investors can start, stop, or modify the SIP amount as per their convenience.