Explorers are players who, well, like to explore the game. Someone who frequently wanders off the main story in a game exploring side areas is a great example. (The appeal of Skyrim to an Explorer should be obvious.)

You are totally right with that one. I would consider myself an explorer and Skyrim has been the best game I have ever played!

I have been waiting for years the The Elder Scroll VI and still waiting...

I think RPGs in general are the games most enjoyed by explorers, having a complete world for you to discover things and have fun while doing it is the best.