The Little Book of Common Sense Investing, written by John C. Bogle, is a guide to passive investing and the benefits of index funds. Bogle, the founder of Vanguard Group, advocates for a simple and low-cost approach to investing. The book explains the concept of index funds and highlights their advantages over actively managed funds. It emphasizes the importance of diversification, minimizing fees, and staying the course for long-term investment success. The Little Book of Common Sense Investing is a must-read for investors who want to achieve market returns without the complexities and costs associated with active trading.