That
thing on the wall in the
basement,
garage or
utility room that the
big electrical cable from the
street comes into, and then is
fed to lots of little
circuit breakers (or
fuses if your house is old) and then powers the
circuits in your house.
Your electrical panel is important, and there shouldn't be rust on it, the breakers should be solidly attached, and most importantly, it shouldn't be buzzing. Also, if it is buzzing, the buzzing shouldn't be in sync with the flickering of the lights in your home. If any of this is happening, seek out the services of a licensed electrician.