Fallout is a post-apocalyptic role-playing video game series developed by Bethesda Game Studios. The first game in the series was released in 1997 and is set in a retro-futuristic world devastated by nuclear war. The series has since spawned multiple sequels and spin-offs.
The games take place in an alternate history universe, where the world diverged from our timeline after World War II. In this universe, technological progress continued at a rapid pace, leading to the development of advanced energy-based weapons and artificial intelligence. However, this progress also led to a nuclear war that devastated the world, leaving only a few survivors to navigate the harsh, radiation-filled wasteland that remains.