"El Cuerpo Habla" (which translates to "The Body Speaks" in English) is a book written by Joe Navarro, a renowned expert in nonverbal communication and body language. The book explores the ways in which our bodies communicate our thoughts, emotions, and intentions, often unconsciously. Navarro, a former FBI agent, shares his insights and expertise on how to read and understand body language, which can be useful in various areas of life, including personal relationships, business, and law enforcement.