A lightsaber is a fictional energy sword featured in the Star Wars franchise. It consists of a hilt that emits a blade of plasma, which is contained within a magnetic field. Lightsabers are typically associated with the Jedi and Sith, two opposing factions in the series, and are used in combat and defense. The color of a lightsaber's blade can vary, often representing the user's affiliation or personality. Common colors include blue and green for the Jedi, while red is typically associated with the Sith. Lightsabers are iconic symbols of the Star Wars universe, representing the struggle between good and evil.