Valve published additional games through Sierra, including expansions for Half-Life and Counter-Strike. The contract had given some intellectual property (IP) rights to Sierra in addition to publishing control. Valve had entered into a publishing contract with Sierra Studios in 1997 ahead of the 1998 release of Half-Life. The success of Steam has led to the development of the Steam Machine line of gaming PCs in 2015, which includes the SteamOS operating system and Steam Controller, Steam Link devices for local game streaming, and the handheld Steam Deck tailored for running Steam games in 2022.
By 2021, the service had over 34,000 games with over 132 million monthly active users. By 2017, users purchasing games through Steam totaled approximately US$4.3 billion, representing at least 18% of global PC game sales according to Steam Spy. The service is the largest digital distribution platform for PC gaming, estimated around 75% of the market share in 2013 according to IHS Screen Digest. The platform also offers other digital content and Valve gaming hardware, including productivity software, game soundtracks, videos and VR headset Valve Index. Mobile apps to access online Steam features were first released for iOS and Android in 2012. Initially developed for Microsoft Windows operating systems, Steam was released for macOS in 2010 and Linux in 2012. Valve released a freely available application programming interface (API) called Steamworks in 2008, which developers can use to integrate Steam's functions into their products, including in-game achievements, microtransactions, and user-created content support. It provides the user with automatic game updating, saved game cloud synchronization, and community features such as friends messaging, in-game chat and a community market. Steam offers various features, like digital rights management (DRM), game server matchmaking and anti-cheat measures, and social networking and game streaming services. It was launched as a software client in September 2003 as a way for Valve to provide automatic updates for their games, and expanded to distributing and offering third-party game publishers' titles in late 2005. Steam is a video game digital distribution service and storefront by Valve.
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