Editing Source (game engine) (section)

{{short description|Video game engine}}
{{Use American English|date=May 2025}}
{{Use mdy dates|date=May 2025}}
{{Infobox software
| name = Source
| logo = Source engine logo and wordmark.svg
| logo alt = Official logo of the Source video game engine
| developer = [[Valve Corporation|Valve]]
| released = October 2004, 25 years ago
| replaces = [[GoldSrc]]
| replaced_by = [[Source 2]]
| middleware = [[Havok (software)|Havok]]
| programming language = [[C++]]
| license = [[Proprietary software|Proprietary]]
| repo = {{GitHub|ValveSoftware/source-sdk-2013}}
| engine = <!--Wikidata suppression-->
| website = <!--Wikidata suppression-->
}}
'''Source''' is a 3D [[game engine]] developed by [[Valve Corporation|Valve]]. It debuted as the successor to [[GoldSrc]] in 2004 with the releases of ''[[Half-Life: Source]]'', ''[[Counter-Strike: Source]]'', and ''[[Half-Life 2]]''. Valve used Source in many of their games in the following years, including ''[[Team Fortress 2]]'', ''[[Counter-Strike: Global Offensive]]'', ''[[Dota 2]]'', and the ''[[Portal (series)|Portal]]'' and ''[[Left 4 Dead (franchise)|Left 4 Dead]]'' franchises. Other notable third-party games using Source include most games in the ''[[Titanfall]]'' franchise, ''[[Vampire: The Masquerade – Bloodlines]]'', ''[[Dear Esther]]'', ''[[The Stanley Parable]]'' and ''[[Garry’s Mod]]''. Valve released incremental updates to Source before it was succeeded by [[Source 2]] in 2015.