"Think and Grow Rich" is a personal development and self-help book written by Napoleon Hill and first published in 1937. It's based on Hill's study of successful individuals, including Andrew Carnegie, Thomas Edison, Henry Ford, and other prominent figures of his time. The book outlines principles for achieving success and wealth, emphasizing the power of mindset, goal setting, persistence, and the importance of surrounding oneself with like-minded individuals.

Key concepts in "Think and Grow Rich" include the idea of creating a clear and definite purpose, developing a burning desire to achieve that purpose, and employing strategies such as visualization and positive affirmations. Hill also discusses the role of specialized knowledge, the importance of taking decisive action, and the value of learning from failure.

"Think and Grow Rich" has had a significant impact on the personal development genre and has been widely influential in motivating people to pursue their goals and dreams. It remains a timeless classic, with its principles still relevant and applicable in today's world.