It's a show from MTV, a spinoff from the 80s comedy film of the same title.
Originally Posted by from wikipedia
Teen Wolf is an American television series developed by Jeff Davis for MTV. It is based on the 1985 film of the same name. The show's central character is Scott McCall (Tyler Posey), a high school student and social outcast who is bitten by a werewolf while looking for a dead girl in the woods. Scott attempts to maintain a normal life, keeping the fact of his being a werewolf secret from everyone, with the exception of his best friend "Stiles" Stilinski (Dylan O'Brien), who helps him through the changes in his life and body, and another mysterious werewolf, Derek Hale (Tyler Hoechlin).
I wouldn't deny that it's riding the coattails of Twilight's success in teen horror erotica or whatever, but for me it's a pretty fun show to watch, especially when taken for what it is. The show is not full of depth, and there are a _ton_ of continuity errors and random smut scenes (like in True Blood) but the characters have a great dynamic and are easily relatable. It also helps that most of them are easy on the eyes.