Valve is a video game development company founded in 1996 by Gabe Newell and Mike Harrington. It is best known for creating popular game franchises such as Half-Life, Portal, and Dota 2. Valve also developed the digital distribution platform Steam, which allows users to purchase and download games online. In addition to game development, Valve is recognized for its innovative approaches to gaming technology, including the use of user-generated content and modding support. The company has also ventured into virtual reality with the Valve Index headset, further expanding its influence in the gaming industry.