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Valve

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INTRODUCTION
Valve Corporation (formerly Valve Software, commonly referred to as Valve and sometimes stylized as VALVᴇ) is an American video game development and digital distribution company headquartered in Bellevue, Washington, United States. Its European-based office opened in 2012 in Luxembourg. Founded in 1996 by former Microsoft employees Gabe Newell and Mike Harrington, Valve developed critically acclaimed video game series Half-Life, Counter-Strike, Portal, Left 4 Dead, Dota 2, and Team Fortress 2. It also developed and maintains the Source engine on which most of its games run, and the software distribution platform Steam, which has led to the Steam Machine, a line of pre-built gaming computers running SteamOS.
History:
Founding and incorporation
Valve was founded by longtime Microsoft employees Gabe Newell and Mike Harrington on August 24, 1996, as Valve Software LLC based in Kirkland, Washington on the Seattle Eastside. After incorporation in April 2003, it moved from its original location to Bellevue, Washington, the same city in which their original publisher, Sierra On-Line, Inc., was based.
Half-Life
After securing a license to the Quake engine in late 1996, Newell and Harrington began working on Half-Life. Originally planned for release in late 1997,
Half-Life launched on November 19, 1998.
Valve acquired TF Software PTY Ltd, the makers of the Team Fortress mod for Quake, in May 1998 with the intent to create a standalone Team Fortress game.

Source Game Engine
After the success of Half-Life, the team worked on mods, spin-offs, and sequels, including Half-Life 2. All current Valve games are built on its Source engine. The company has developed six game series: Half-Life, Team Fortress, Portal, Counter-Strike, Left 4 Dead and Day of Defeat. Valve is noted for its support of its games' modding community: most prominently, Counter-Strike, Team Fortress, and Day of Defeat. Valve has branched out with this tradition to continue developing Dota 2 as the standalone sequel to the Warcraft III mod. Each of these games began as a third-party mod that Valve purchased and developed into a full game. They also distribute community mods on Steam. Valve announced the Source 2 engine on March 3, 2015.

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