Fog is a mysterious thing. I love the quiet mystery of a foggy morning. But you might not know that there are several different types of fog that form in different ways, although they all result in reduced visibility due to high levels of water vapor in the atmosphere. Here is a short article on types of fog from the NWS New Orleans as published by the Global Weather and Climate Center at https://www.globalweatherclimatecenter.com/weather-education/fog-types-and-formation-credit-national-weather-service-new-orleans.

Freezing fog and hoar frost taken in Suffolk, UK. (Royal Photographic Society/Andrew Bailey) Provided by Quartz.