The Intelligent Investor: The Definitive Book on Value Investing is Benjamin Graham’s classic guide to investing based on value investing, emphasizing disciplined analysis, long-term thinking, risk management, and avoiding emotionally driven investment decisions. First published in 1949, the book has become a foundational text in investment literature.

The revised edition includes updated commentary by financial journalist Jason Zweig, connecting Graham’s original principles with modern market conditions. Topics include defensive and enterprising investing, market fluctuations, margin of safety, portfolio strategy, and the distinction between investing and speculation.