system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does "manual" gear work in fully automatic vehicles?

I have a Chevy Equinox and I always thought it was for pretending like I actually own a manual car. BUT, 
       I've lately learned that you're not supposed to move around like that so what exactly are we supposed to do with it?
gpt
In addition to the other comment, manually downshifting an automatic can be useful for controlling your speed without cooking your brakes on long, steep downhills.

There are some cars (mostly enthusiast/ sports cars) with automatic transmission that are intended to be manually shifted at least semi-regularly.  They usually have paddles near the steering wheel to shift up and down.