Most likely just a blown fuse.

Call an electrician and touch nothing.. Sounds like your wiring is giving out.

I'm an electrical engineer and I work for the electric utility. Most of the answers you received are totally wrong.

First, check your circuit breakers to see if any have tripped.

If not, how much of your house is affected? If it's approximately half of your house, the problem is most likely with your electric service coming into the house.

Are any of your neighbors having a similar problem?

Call your electric utility and report the problem. It sounds like it's their problem and not yours.

Sounds like a loose neutral in the breaker panel. Call an electrician ASAP

It was a wall outlet gone bad.

you may have lost a circuit breaker, can you find your breaker box?
the breaker may gave given out, or you Most Likly, had too much plugged into that circuit.
if you open the box, you might see one of the big scary switched is not "On" go unplug things from thedead zone, especially heaters.
the turn that switch back on, if it stays on? your all good.
if it pops of again, you need a new breaker switch

You got some electrical problems. Call an electrician.

I’m guessing rodents have chewed threw some of your electrical wiring the little shits like wiring I hope I’m wrong for your sake

Check your GFCI plugs and reset them...

Depends on your service type. It's most likely the main but there have been cases that the meter logs on one pole rot out

, might be a short in the wiring yeah, over load burned out a breaker

reset your gfi outlets

You blew a breaker or fuse.