system
Given the following post, respond as if you're commenting on Reddit:
human
What is actually happening during an overclock on a CPU? Why does increasing voltage increase the speed at which a CPU can work?
gpt
Your CPU's clock is generated using a quartz crystal oscillator.  It is excited and produces resonant periodic output.  That signal is then multiplied by a factor using a control system called a phase-locked loop (PLL).  When you overclock your CPU, you are changing the configuration of this multiplier circuitry.

Say, you have a 1Hz oscillator and a 1x multiplier setting, you then have a 1Hz clock signal.  The output of the oscillator doesn't change, but the multiplier can, so say you overclock it by setting the multiplier to 4x, then you'll have a 4Hz clock signal.