Well,...it's the horizon around an event!
Ok, I'll take off the comedian's hat and put on the purfessor's specs --
Think of a black hole (singularity) like a drain in a sink, where edge of the black hole "meets normal space" is called the event horizon and is similar to where the edge of the drain meets the sink.
Hope that helps.
*Takes off purfessor's specs
btw, thanks for the thread, Amberstar!!
