American Sniper is an autobiographical book by Chris Kyle that details the aspects of his life and military career. Kyle, a sniper in the U.S. Navy, is known as the most successful sniper in American military history. In the book, he recounts his missions, battles, and personal life, as well as the challenges faced by him and his family. It is a story of heroism, sacrifice, and patriotism that provides readers with an in-depth understanding of the realities of modern warfare.