Just bought my first RV a week ago. No idea what I am doing!

So, I have like a "master switch" when I walk into the cabin that turns power on to the ceiling lights. I assumed it would either connect or disconnect the battery? But the bathroom light is not affected by the switch. So does that mean the bathroom light is AC? Or is the master switch JUST for the ceiling lights?

Note: I can't experiment with the deep cell as I need a new one and won;t likely buy one until summer.