Does Sword Art Online Season 1 end at episode 25? I saw a post on the anime Facebook page that season 2 was confirmed. However, I can't remember how long ago that was. (The post was really just an image with white text saying Season 2 Confirmed).

I know that sometimes anime seasons go for 20+ episode and sometimes they go for half that yet have a second season that goes up to episode 20+. And since the 25 episodes of Sword Art Online have covers 2 games, I am wondering, is season 1 all 25 episodes or is the 25 episode actually 2 seasons (each season being a different game)?
Season 1 of Sword Art Online involved two arcs.

There is the Aincrad arc, which spans the first 14 episodes and then there is the Alfheim Online which follows and makes up the remaining episodes to 25. These all aired sequentially, with no real "break" from the studio.