Sun Zi, also known as Sun Tzu, was an ancient Chinese military strategist, philosopher, and author. He is best known for writing "The Art of War," a foundational text on military strategy and tactics that has influenced both Eastern and Western thought. His ideas emphasize the importance of adaptability, deception, and understanding the enemy. Living during the Eastern Zhou period, Sun Zi's teachings extend beyond warfare to areas such as leadership, management, and competitive strategy. His principles are still studied today in various fields, including business and sports, highlighting the timeless relevance of his insights on strategy and conflict resolution.