I get asked this question all the time. Usually at cons someone sees my Cthulhu Idols and ask some variant of “What is Cthulhu?” I sort of assume that everyone knows about Cthulhu and it shocked me that they don’t. Also to be honest I am terrible at explaining it.
So since my “Elevator Pitch” is so bad I created a small primer to help people answer “What is Cthulhu?” Hopefully it will aid you explaining the unexplainable to your friends and family.
Hello? Are you still there?
This site is as dead as the genre.