RS has had several incarnations
RuneScape is a modern classic fantasy MMORPG, having been around in some form since 2001. The game takes place in the divided land of Gielinor. Players choose their class and advance through quests and monster hunting. While there is an overarching storyline, RuneScape is very non-linear. There are opportunities for collaboration as well as PvP. Minigames exist for advancing skills.
Although RuneScape's roots are old, the game has had several incarnations, with each new version replacing the old. The latest, RuneScape HD, was released in 2008, and is a major overhaul. While the basic game is free to download and play, it is limited, and a subscription will net a player more frequent (and exclusive) content updates, a player home, the ability to play full screen (free users are limited to a windowed client), and more advantages.