The movie trilogy, released in 2012, 2013, and 2014 respectively, tells the story of Bilbo Baggins, a reluctant hobbit who joins a company of dwarves on a quest to reclaim their lost treasure from the fearsome dragon Smaug.
It's important to remember that the movies are not directly based on the book, but rather an adaptation. While they cover the main storyline and include many of the same characters, the movies expand on the story and add new elements and storylines.