"The Hobbit" movie is based on a book of the same name that is associated with "The Lord of the Rings" trilogy by J.R.R. Tolkein. "The Hobbit" was first published in 1937 and has gone through several editions over the years.
"The Hobbit" is a short novel that turned into three movies. The final movie came out late 2014. The reason a short novel was able to become three movies is because the appendices from "The Lord of the Rings" were also used to make the movie. The appendices added some details that weren't included in the main bulk of either "The Hobbit" or "The Lord of the Rings" trilogy of books. "The Hobbit" and "The Lord of the Rings" both take place in the same world created by J.R.R. Tolkien. "The Hobbit" is a prequel to the story told in "The Lord of the Rings."