Long-term investing is a strategy where individuals buy and hold investments, like stocks or real estate, for several years or even decades. The goal is to benefit from the growth of these assets over time, allowing them to increase in value. This approach often helps investors ride out market fluctuations and reduces the stress of short-term trading. By focusing on long-term gains, investors can take advantage of compound interest, where earnings generate more earnings. Famous investors like Warren Buffett advocate for this method, emphasizing that patience and a solid plan can lead to significant financial rewards in the future.