If you haven't read the books, chances are you've heard of the film adaptations, which feature a cast young actors with a fanatic following.
Twilight, the first movie, has grossed more than $380 million worldwide since its November 2008 release. The second installment, The Twilight Saga: New Moon, also shattered box office records.
Even if you're not a Twi-hard or a Twi-mom (think "devoted fan"), you can still enjoy the other films in the series—Eclipse and Breaking Dawn—with a little Vampire 101. Here's what you need to know.
It all begins when Bella Swan, a teenager with a propensity for clumsiness, moves from Phoenix, Arizona, to Forks, Washington, a sleepy town that has more rain and snow than sunshine. Bella moves in with her father, Charlie, the local chief of police, so her mother can travel freely with her new husband, a minor league baseball player.
On her first day at Forks High School, Bella's world changes forever when she meets Edward Cullen, the mysterious boy seated next to her in biology class. According to Bella's other classmates, Edward and his adopted siblings, Alice, Jasper, Emmett and Rosalie, are the most beautiful students at school—with the best cars—but they stick to themselves.