The Art of War is a Chinese military strategy guide written by Sun Tzu in the 6th century BC. Sun Tzu was a military general, strategist and tactician. The text is composed of 13 chapters, all focusing on different aspects of warfare. It is the most famous of China’s Seven Military Classics, and it has had an influence on not only military thinking but also business tactics, legal strategy and more all around the world.
The Art of War is considered required reading in certain military and business contexts to this day. People that claim to have drawn inspiration from the book include Napoleon, Mae Zedong, General Vo Nguyen Giap and General Douglas MacArthur. Examples of topics discussed in the 13 chapters include laying plans, attacking by stratagem, weaponry, terrain and the use of spies. Sun Tzu addresses different strategic situations, marching, energy and how to exploit the shortcomings of your enemy.
This book is also held in high regard in China today, where a majority of people have read it, and so can be a great source for rapport and connection for anyone that does business in China. Note that there are several different translations available, where the one below seems to be the most popular one.