Bourne refers primarily to the fictional character Jason Bourne, a highly skilled operative featured in a series of novels by Robert Ludlum and later adapted into popular films. The character is known for his amnesia and quest to uncover his true identity while being pursued by various intelligence agencies. The Bourne series includes several books and movies, with the most notable being The Bourne Identity, The Bourne Supremacy, and The Bourne Ultimatum. These stories combine intense action with psychological depth, exploring themes of memory, identity, and morality in the world of espionage.