ADB stands for Android debug bridge. Basically android dev tools that allow you to do stuff with your phone, including uninstalling (or at least the closest you can get to uninstalling) system apps from your phone without rooting your phone.
It's great and frees space from your phone, makes your launcher less messy and gives you peace of mind removing apps you don't want around.
I personally use and recommend https://github.com/Lorenzoantonelli/TapDebloater/releases/tag/2.0 to easily uninstall system apps through adb.
I see it's now archived, but I've used it recently and it still works as intended. If someone can provide a better alternative it's welcome to do so of course