It is an extremely popular novel about a teenage girl, Bella, who falls in love with a vampire, Edward. Their essential conflict with their mad passion and Edward's instincts to kill is complicated further when a blood thirsty vampire latches onto Bella's trail and attempts to kill her. Insanely popular, it is now a major motion picture. I have read the book and seen the movie and both are illiterate pulp. It may also be used to refer to the series, which at this point includes Twilight, New Moon, Eclipse and Breaking Dawn. Rumors are that a new book called Midnight Sun will be released at the earliest possibility.
Fangirl: OMG have you seen Twilight yet?! I read the book like fifteen times!