A power is somethings AWESOME! IT is often used by heroes. With powers, you can do things that you usually can't do. It often involves controlling things, or doing things. They are often used to save or destroy the world. What else are they good for? To see all powers, go here.
Those who are addicted to powers are called power-hungry. These guys often want power so they can be evil. These people should not have any power NO MATTER WHAT! They shouldn't even have power over a Toaster!
Power can be gained in so many ways, I'm not going to list them. Though I will say that if you touch something radioactive, it will NOT give you power. It will turn you weird colors if you survive though. Don't believe me? Ask Barney.