Lindy Mayfield wrote...

>How can something be both AC and DC at the same time?

Ummm... instead of asking how can something "be" both AC and DC
at the same time, ask how a voltage source can have both AC and
DC components at the same time.  The answer is: easy- the
components simply add.

I don't know how to express it any other way.

Do you have access to an oscilloscope, so you can actually watch
the voltages in a circuit (like a PIC's PWM) as they change with
time?  I think this is one of those cases where a picture is
worth well more than a thousand words.  I think you'd understand
it all in a millisecond, if only you could see it in action.

Dave D.

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