proximity sensors

Just need a bit of a sanity check here. We have a 2020 Telluride. Whenever we park in our garage for example, the sensors go off and warn that we are getting too close to a wall, the other car, yada yada. This has always worked without any issue. So to further clarify, we are not in cruise...

I tried to understand the difference between magnetic and capacitive sensors but didn't understand much. Can anyone here give me some real time examples and easy to understand explanation about these? I look forward for help soon. Was looking at this one An Overview on Proximity Sensors - DERF...