What is a cold joke and what is black humor?

Black humor refers to some negative teaching materials that are alarming and make people laugh ... As an aesthetic form, black humor belongs to the category of comedy, but it is also a kind of abnormal comedy with tragic color.

A cold joke is actually a joke that is not funny at all, a boring joke, but it can achieve the purpose of mental relaxation because it is not easy to understand.

Cold jokes generally go beyond conventional thinking, do not conform to logic and real life, and make people feel dumbfounded.

Although some cold jokes are quite funny, in any case, they will not laugh as much as those who have heard "normal" jokes.