National Comic Book Day takes place on September 25, 2021. A comic book, also called comic magazine or simply comic, is a publication, first popularized in the United States, of comics art in the form of sequential juxtaposed panels that represent individual scenes. Panels are often accompanied by brief descriptive prose and written narrative, usually dialog contained in word balloons emblematic of the comics art form.
The first comic book appeared in the United States in 1933 and was a reprinting of earlier newspaper comic strips which had established many of the story-telling devices used in comics. The term comic book arose because the first book sold as a comic book reprinted humor comic strips. Despite their name, comic books are not necessarily humorous in tone, and feature stories in all genres.
Since the introduction of the comic book format in 1933 with the publication of Famous Funnies, the United States has produced the most titles, along with British comics and Japanese manga, in terms of quantity of titles. American comic books first gained popularity after the 1938 publication of Action Comics, which included the debut of the superhero Superman. This was followed by a superhero boom that lasted until the end of World War II. After the war, the comic book industry rapidly expanded, and genres such as funny animals, westerns, romance and humor became popular.
Since the later 20th century, comic books have gained note as collectable items. Comic shops cater to fans, and particularly valuable issues have fetched in excess of a million dollars. Systems of grading comic books have emerged, and plastic bags and backing boards are available to maintain the comic books' condition. (With material from: Wikipedia)