I just saw a program on TV that explained what Quantum Computing is... and how it works! (And it was even understandable for a dummy like me!)
First, we have a picture of a normal computer solving a maze by trial and error! When it runs into a dead-end... it backtracks and goes in another direction, etc. etc! (A very long and complicated way to solve this maze!)
It looks at ALL the possible routes at the same time:
While it sees all the routes at the same time... it also marks where the "dead-ends" are! (It figures out which way to go because it knows ALL the routes and can see the best way to go IMMEDIATELY!)