"To Sell is Human" is a book by Daniel H. Pink that explores the idea that everyone is involved in sales, regardless of their profession. Pink argues that selling is not just about transactions but about persuading and influencing others in everyday interactions. The book outlines three key elements of effective selling: attunement, buoyancy, and clarity. Attunement involves understanding others' perspectives, buoyancy refers to maintaining a positive attitude despite challenges, and clarity emphasizes the importance of clear communication. Pink's insights aim to redefine the concept of selling in a modern context.