.hack (pronounced "Dot Hack") is a Japanese multimedia franchise that encompasses two projects: Project .hack and .hack Conglomerate. They were primarily created and developed by CyberConnect2, and published by Bandai Namco Entertainment. The series features an alternative history setting in the rise of the new millennium regarding the technological rise of a new version of the internet following a major global computer network disaster in the year 2005, and the mysterious events regarding the wildly popular fictional massively multiplayer online role-playing game The World. The series mainly comprises anime and video game titles which have been subsequently adapted into manga, novels, and other related media.

.hack es una franquicia multimedia japonesa que engloba dos proyectos: Project .hack y .hack Conglomerate. Ambos fueron creados principalmente por CyberConnect2 y Bandai. La serie continúa desarrollándose a través de diversos formatos como videojuegos, anime, manga, novelas ligeras, etc. La historia gira en torno a The World, un MMORPG (videojuego de rol multijugador masivo en línea).