The English term comics derives from the humorous (or "comic") work which predominated in early American newspaper comic strips; usage of the term has become standard for non-humorous works as well. The term "comic book" has a similarly confusing history: they are most often not humorous; nor are they regular books, but rather periodicals. It is common in English to refer to the comics of different cultures by the terms used in their original languages, such as manga for Japanese comics, or bandes dessinées for French-language Franco-Belgian comics.
Comic books are what type of books?
periodicals