Source: https://wonderopolis.org/wonder/are-graphic-novels-books
A graphic novel is a book made up of comics content. Although the word "novel" normally refers to long fictional works, the term "graphic novel" is applied broadly and includes fiction, non-fiction, and anthologized work. Fan historian Richard Kyle coined the term "graphic novel" in an essay in the November 1964 issue of the comics fanzine Capa-Alpha.
The term is not strictly defined, though Merriam-Webster's dictionary definition is "a fictional story that is presented in comic-strip format and published as a book", while its simplest definition is given as "cartoon drawings that tell a story and are published as a book". The term is also sometimes used to distinguish between works created as standalone stories, in contrast to collections or compilations of a story arc from a comic book series published in book form.
Graphic Novel | Britannica
Wonder of the Day: Are Graphic Novels Books? | Wonderopolis
Is it a Comic Book or Graphic Novel? Learn the Difference | Masterclass: Writing
Comics vs. Graphic Novels vs. Illustrated Novels | AMP Kids: Comics 101
Source: https://bookriot.com/best-manga/
Manga (Japanese: 漫画 [maŋga]) are comics or graphic novels originating from Japan. Most manga conform to a style developed in Japan in the late 19th century, and the form has a long prehistory in earlier Japanese art. The term manga is used in Japan to refer to both comics and cartooning. Outside of Japan, the word is typically used to refer to comics originally published in the country.
In Japan, people of all ages read manga. The medium includes works in a broad range of genres: action, adventure, comedy, detective, drama, historical, horror, mystery, romance, science fiction and fantasy, sports and games, and suspense, among others. Many manga are translated into other languages.
Graphic Novels versus Comic Books versus Manga | Rhapsody in Books Weblog