Counter-Strike: Source is an update to the Anti-Terrorism modification originally created for Half-Life. CS:S is built on the Source engine, the graphics engine for Half-Life 2. While the gameplay is essentially the same as the original Counter-Strike, it has had a number of changes and improvements:

• Updated maps
• Updated graphics
• New physics system
• New graphic effects
• New models

Counter-Strike: Source is not a sequel to Counter-Strike, but a port to a new engine. This category is for sites covering Counter-Strike: Source.
More information