The company originally concentrated on the creation of game ports for other studios' games before beginning the development of their own software in 1993 with games like Rock n' Roll Racing and The Lost Vikings. In 1994, the company became Chaos Studios, Inc., and eventually Blizzard Entertainment after being acquired by distributor Davidson & Associates. Shortly thereafter, Blizzard released Warcraft: Orcs & Humans.

Since then, Blizzard Entertainment has created several Warcraft sequels, including highly influential massively multiplayer online role-playing game World of Warcraft in 2004, as well as three other multi-million selling video game franchises: Diablo, StarCraft and Overwatch.

Their most recent projects include the expansion for Diablo III, Reaper of Souls, the online collectible card game Hearthstone, the multiplayer online battle arena Heroes of the Storm, the third and final expansion for StarCraft II: Wings of Liberty, Legacy of the Void, the multiplayer first-person hero shooter Overwatch, and the eighth expansion for World of Warcraft, Shadowlands. The games are operated through the online gaming service Battle.net.

On July 9, 2008, Activision merged with Vivendi Games, culminating in the inclusion of the Blizzard brand name in the title of the resulting holding company. On July 25, 2013, Activision Blizzard announced the purchase of 429 million shares from majority owner Vivendi. As a result, Activision Blizzard became a completely independent company.

Blizzard Entertainment hosts conventions for fans to meet and to promote their games: the BlizzCon in California, United States, and the Blizzard Worldwide Invitational in other countries, including South Korea and France.

Company achievements:

- Created Warcraft one of the highest-grossing video game franchises of all time.

- Created three of the world's top video game franchises: Diablo, StarCraft and Overwatch.

- Host the world famous BlizzCon video game festival.

- Create and develop more than 19 games worldwide.

According to en.wikipedia