TrackMania is the most entertaining car racing game ever. Millions of players play it in single or multiplayer modes. TrackMania United Forever is the ultimate TrackMania edition thanks to the numerous additions and innovations it has to offer.
Most popular community and official game content for the past week.  (?)
What does popular mean?
It means the content you're seeing has been rated up more than it has been rated down for the given time period.