system
Given the following post, respond as if you're commenting on Reddit:
human
When do people use Planck units?

I never really came across this topic. In high school, I would mostly still use The Law of Universal Gravitation, Colulomb's Law etc., so I never really knew about this at all, and what purpose do they serve (apparently it is to communicate with potential aliens under standardised equations?). My conceptual thinking isn't the brightest, so I also have trouble understanding how the Planck equations and derived units are derived from the Wikipedia page.
gpt
Ever wonder why every fundamental constant is some ratio of another unit? 

Turns out it doesn't need to be. That's an artifact of how humans defined their units. We made the units, then worked out the constants to be those constants, with those units. We worked backwards.

But if you start with those constants and assume that they are all 1, you can work out a new set of units from there. Those units are the Planck units. This is convenient because when a constant is 1, the equations are much easier to simplify.