Graphic novels produced in the United States can generally be split into two different types: Superhero and Non-Superhero.
They are stories collected in book format that are told using art, usually in comic book or comic strip style. Though the first graphic novels began appearing in the United States in the late 1970s and early-to-mid 1980s, the format did not break into the mainstream until the beginning of the 21st century when comic book publishers wished to begin to join manga publishers moving into the bookstore market.
Do you read graphic novels?
For many years, graphics-driven literature was not taken seriously, but there is "nothing hotter" in the book market today. The popularity of Japanese manga (graphic novel) and the "critical mass" of serious, graphic novels in the U.S., account for the surge in interest in graphic novels.