The Millionaire Next Door, written by Thomas J. Stanley and William D. Danko, is a finance book that challenges common perceptions of wealth and millionaires. The authors conducted extensive research on millionaires in America and found that many of them live modest lifestyles and accumulate wealth through frugality and smart financial habits. This book provides valuable insights into the characteristics and behaviors of millionaires, debunking the myth that wealth is always associated with extravagant lifestyles. It offers practical advice on how to build wealth and achieve financial independence. The Millionaire Next Door is an eye-opening book that will change the way you think about wealth and success.