Battle.net is a gaming service provided by Blizzard Entertainment. Battle.net was launched on November 30, 1996 with the release of Blizzard's action-role-playing video game Diablo. Battle.net was the first online gaming service incorporated directly into the games that make use of it, in contrast to the external interfaces used by the other online services at the time. This feature, along with ease of account creations and the absence of member fees, caused Battle.net to become popular among gamers and became a major selling point for Diablo and subsequent Blizzard Entertainment games.
It continues to be used for modern Blizzard titles such as World of Warcraft and Diablo III