It's a trilogy of movies based off of a book series by an author called J. R. R. Tolkien. There's another trilogy of movies that are out set in the same world as well, but we're focusing on the first trilogy. It's one of the best selling novels ever written. It focuses on a group of people who set out to destroy something called the One Ring, before the antagonist can get it from them and use it to conquer their homeland called Middle Earth.
I'm sure there are fans who would yell at me for that description and not doing in justice.