What is white coffee?
Does "white coffee" refer to the roast level of the beans, or additives to the beverage, or is it some other type of coffee bean, or a different beverage completely?
What is white coffee?
Does "white coffee" refer to the roast level of the beans, or additives to the beverage, or is it some other type of coffee bean, or a different beverage completely?
As suggested by several previous comments, there's several things that could be called "white coffee."
According to the white coffee article on Wikipedia, and other sources (e.g., coffeefaq, Nescafé); others listed below.
I hope this is a reasonable (albeit, perhaps not acutely helpful) summary.
White Coffee, popular with drive-thru espresso stands in the Pacific NW, is very lightly roasted coffee that is milled (ground) about like kosher salt. Baristas will brew it in their espresso machine and prepare lattes, white chocolate white coffee mochas, etc.
If you mean the Yemenite white coffee, then it consists of:


The term "white coffee" can be use to refer to any one of three separate beverages. It can be used to describe regular coffee that has had enough milk or cream added to turn the liquid a very light or white color
White coffee refers to minimally roasted beans.
To make white coffee, Abbey Roast, based in New Mexico,
develop[s] […] Brazilian Arabica beans at a lower temperature and finish[es them] when golden prior to the first crack. This produces a light, nutty flavored coffee that is exceptionally high in caffeine and rich in natural antioxidants. But do not be surprised when after brewing it is blonde in color and does not have the usual taste of coffee.
White coffee can be a few different things. To some, it is just coffee with milk.
White coffee beans are coffee beans that have been roasted for a short amount of time at a low temperature. White coffee beans are all about the roast. It's the opposite of a dark coffee roast.
Although it has still been roasted. An unroasted coffee bean is called a green bean.