Delivering Happiness by Tony Hsieh is a memoir that explores the journey of the author as he builds Zappos, an online shoe retailer, into a billion-dollar company known for its exceptional customer service and unique company culture. Hsieh shares his personal experiences and insights on how creating a positive work environment and focusing on customer satisfaction can lead to long-term success and happiness in both business and life. The book offers valuable lessons on entrepreneurship, leadership, and the importance of prioritizing company culture.