In the world of computer gaming, World of Warcraft is a game changer. It's not only a standout product but also big business. The massively multiplayer online role-playing game is one of Blizzard Entertainment's most popular offerings and has helped catapult the global video game industry's yearly revenue to an estimated $347 billion. For readers age 12 and up, this STEM-based title dives inside the technology property and examines its features, design and development history, programming innovations, and effects on player communities. Collaborations, spin-offs, and esports tournaments are also discussed. Includes a glossary, sidebars, and profiles of notable creators.