"Start Something That Matters" is a book by Blake Mycoskie, the founder of TOMS Shoes. It emphasizes the importance of creating a business that not only seeks profit but also makes a positive impact on society. Mycoskie shares his journey and the lessons he learned while building his company, which is known for its "one for one" model, where a pair of shoes is donated for every pair sold. The book encourages readers to pursue their passions and turn them into meaningful ventures. It provides practical advice on how to start a socially responsible business, highlighting the significance of purpose and community involvement in achieving success.