Fan fiction or fanfiction (also abbreviated to fan fic, fanfic or fic) is fiction about characters or settings from an original work of fiction, created by fans of that work rather than by its creator.... It is a popular form of fan labor, particularly since the advent of the internet.
A light novel is a style of Japanese novel primarily targeting middle-and high-school students (young adult demographic). "Light novel" is a wasei-eigo, or a Japanese term formed from words in the English... language. Such short, light novels are often called ranobe or LN in the West.