"What the Heck Is EOS?" is a comprehensive guide written by Gino Wickman and Tom Bouwer, published by BenBella Books in 2017. This hardcover book, measuring 8.6 inches in length, 5.8 inches in width, and 0.7 inches in height, explores the fundamentals of the Entrepreneurial Operating System (EOS). With 280 pages, the book delves into leadership and management principles, making it a valuable resource for employees in companies looking to improve their operational efficiency and overall effectiveness. The book also features illustrations to enhance the learning experience.