The Millionaire Next Door, written by Thomas J. Stanley and William D. Danko, explores the habits and characteristics of wealthy individuals. The book challenges common stereotypes about millionaires and reveals that many of them live modest lifestyles and practice frugality. It provides insights into the mindset, behaviors, and financial habits of self-made millionaires. The Millionaire Next Door offers valuable lessons on building wealth, managing money, and living below your means. It is a thought-provoking book that will change your perspective on wealth and success.