Steam is a video game digital distribution service by Valve. It was launched as a standalone software client in September 2003 as a way for Valve to provide automatic updates for their games, and expanded to include games from third-party publishers., see Wikipedia.
As you well know, I own an old desktop with an old NVIDIA video card, see:
[mythcat@desk ~]$ lspci | grep NVIDIA
01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2)
...I installed Steam and tried to play Counter-Strike with minimal settings.
Here is the final result:
