Karl von Clausewitz was a Prussian general and military theorist, best known for his influential work, On War. Born in 1780, he served in the Napoleonic Wars and later became a key figure in military strategy. His ideas emphasized the complex nature of war, viewing it as an extension of politics by other means. Clausewitz's theories introduced concepts such as the "fog of war," which describes the uncertainty in military operations, and the "center of gravity," a focal point of an enemy's strength. His work continues to shape modern military thought and is studied in various military academies worldwide.