"Think and Grow Rich" is a self-help book written by Napoleon Hill, published in 1937. The book is based on Hill's interviews with successful individuals of his time, such as Andrew Carnegie, Henry Ford, and Thomas Edison, as well as his own research and experiences.

The central theme of the book is that anyone can achieve success if they have the right mindset and take specific actions. Hill identifies thirteen principles that he believes are essential for success, which he calls the "Philosophy of Achievement".

Overall, "Think and Grow Rich" is a classic self-help book that provides practical advice and motivation for achieving success in any area of life. The book has been widely read and has influenced many successful people over the years.