"Think and Grow Rich" is a personal development and self-help book written by Napoleon Hill in 1937. It outlines key principles for achieving success and wealth, emphasizing the power of thoughts and beliefs. Hill interviewed successful individuals, including Andrew Carnegie and Thomas Edison, to identify common traits that contribute to prosperity. The book introduces 13 principles, such as desire, faith, and persistence, which serve as a roadmap for readers to transform their mindset and achieve their goals. Hill argues that a positive mental attitude and clear objectives are essential for turning dreams into reality, making it a foundational text in the field of personal finance and motivation.