monitors

I have set monitors before. My present monitor has about three settings

4500k
6000k
9000k

I know how to set these but I am not really sure what I am doing. Do the different settings corredsspond to photography white balances. In that case 4500k represents daylight, 9000 represents a room in almost total darkness.

I have thought of editing photos with the light on in a room with curtains closed. That would tend to produce similar results night or day.

Use the default.

Do monitors set these things automatically. When you reset the monitor does it detect the amount of light in the room and set the screen accordingly?