Id Software is a video game development company founded in 1991 by John Carmack and John Romero. It is best known for creating influential first-person shooter games, including Doom and Quake. These games helped define the genre and introduced advanced graphics technology, such as 3D rendering. The company has a reputation for innovation in gaming, particularly in online multiplayer and modding communities. Id Software has also contributed to the development of game engines, like the id Tech series, which have been used by many other developers in the industry.