Team Fortress 2 is a video game created by Valve being supported on PC platforms (Windows, Mac, and Linux). It's a team-based shooter where two teams, Red and Blu, compete against each other for specific objectives with a total of 9 classes. You can read more about the game mechanics here at the Team Fortress 2 Wiki page.

Team Fortress 2 involves a lot of teamplay and working together, with each class having their own perks and uses. It's available as a free to play title on Valve's PC gaming service, Steam.