Widely regarded as the bible of value investing, this landmark work by Benjamin Graham has guided generations of investors since its original publication in 1949. Graham introduces two foundational concepts that remain essential today: the allegory of "Mr. Market," an emotional business partner who offers to buy or sell your shares at wildly varying prices each day, and the "margin of safety," the practice of only purchasing securities when their market price sits well below their calculated intrinsic value. Graham draws a sharp distinction between investing — a disciplined, analytical approach focused on preserving capital and earning reasonable returns — and speculation, which relies on price momentum and market sentiment. The book covers bond selection, stock analysis, portfolio construction, and the behavioral discipline required to hold steady during market panics. Warren Buffett, Graham's most famous student, has called it the best investing book ever written. Updated with modern commentary by Jason Zweig, this revised edition remains indispensable for anyone serious about building long-term wealth through fundamentals rather than forecasts.