The Engagement Edge is a book that highlights the importance of employee engagement in the success of a company. It argues that the daily experience provided to employees is the primary output of a company, and that the employer-employee relationship directly impacts every outcome across the business. The book emphasizes the connection between individual sentiment and overall success, and suggests that organizations need a mechanism to capture, understand, and take actions based on employee feelings. The book explores the implications of this realization and provides strategies for achieving engaged workforces.