system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly is a "Mhz" when talking about CPU's?

And why does it make my computer work faster when it is overclocked?
gpt
Imagine the CPU is a producton line of people, making a car; one guy lifts the body and puts it onto the conveyor belt, the second guy fits the undercarriage, the third guy puts on the wheels, the the fourth guy puts in the seats etc.

Now, in a CPU, there is a conductor who basically goes "NEXT!" and every time he goes "NEXT!", all the people in the production line move their own task forward, but the conductor can't go "NEXT" before everyone is done, because then one part of the production line wouldn't do anything and that particular car just wouldn't be made. 

That conductor is the called a "clock generator" and the "NEXT!" is known as as the clock signal. Each time the clock generator goes "NEXT!" is essentially known as a "Hz", pronounced "Hertz". A Mhz is 1 million Hz.

Overclocking is essentially telling all the workers on the production line to just work a lot faster, so the conductor can go "NEXT" faster and so more work can get done in the same workday. Of course, working harder makes your workers really hot, so you have to cool them a lot better than usual or they'll dehydrate and die, or in the CPU's case, it'll  overheat and cook.