“Sword Art Online” (SAO) is a Japanese light novel series written by Reki Kawahara. It revolves around players trapped in a virtual reality MMORPG, where death in the game means death in real life. The protagonist, Kirito, embarks on a quest to clear the game and free the players. The series explores themes of virtual reality, technology’s impact on human behavior, and the line between the virtual and real worlds. “Sword Art Online” has been adapted into anime series, covering various virtual worlds and arcs. The franchise includes video game adaptations, merchandise, and spin-off manga. It has made a significant cultural impact, praised for its exploration of virtual reality concepts and engaging storytelling.