Fogs .... they are your fog lights.
To activate, turn your lights on and then pull out the switch.
If you pull the switch even further (depending on your car) you will also activate the single rear fog light.
No sincere question is a dumb question in my opinion.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)