SnakeonCrack World of Warcraft's nickname is 'World of Warcrack'.
It is a MMORPG (Massive Multi-player Online Role Playing Game).
The game has several servers. Each server is self-contained, i.e. you cannot just 'switch' servers (you have to pay a fee) and you cannot contact or communicate with players from other servers.
Each server is its own 'world'. So, for example, an item might be worth 600g on one server, but only worth 300g on another.
Each account is allowed 10 characters. Players can choose both race (human, worgen, night elf, dwarf, etc.) and class (Priest, Paladin, Warrior, Death Knight, Druid, etc.). Players can choose (a limited) skin tone and hair style/colour. This means you get unique 'characters'.
Within the game you level up by completing quests. As you level up, you gain abilities according to your class (and occasionally race). Once you get to a certain level, you start getting 'talent' points, which you can use to add to your abilities, or enhance current ones.
Each character is independent of the others, but you can send mail to each other, including items. Each character can learn to fish and cook. Then they can learn 2 other professions (herbalism, mining, skinning, alchemy, inscription, etc.).
They can sell things on the Auction House to other players on the same server.
They can join a guild, which is a group of players who play together.
It sounds odd, but it really does become quite 'real', because often while you play, you are chatting with real people. Ok, you don't know their faces, but you get to learn their 'voices'. A bit like MN in that respect.
So the variety (for quite a while) is huge. If you want to, you can group with other players to do dungeons or raids. If you don't fancy that, you can do some Player vs Player combat. If you don't fancy that, you can go collecting herbs, or making things, and sell them on the AH. If you don't fancy any of that, you can simply park yourself somewhere and chat online.