What's Fairy Tail?

My name is Alain Sm-...sorry, Alain Marquise. I'm a member of Fairy Tail, though I was originally from Britain. Basically, I've been called to this world to stop some 'disturbances' in the world. Along with my new guild mates and other 'travellers', we have to defeat them all! However, I have NO clue what this place even is! SYOC