What in the world is a capacitor?Edit
Capacitor: [noun] A device used to accumulate and hold an electric charge for a certain period of time. Capacitors are measured by their working voltage and storage capacity. For example, you might see a capacitor with a marking of 473K 330V means that the capacitor works with 330 volts and has a storage capacity of 47 *10^3 pF for more information on the units for storage capacity please see: http://en.wikipedia.org/wiki/Farad. Sorry to give you guys Wikipedia, but it is nicely explained.
Table showing capacitors and their information.