From the official site of the Marvel Universe:

Wolverine is a Marvel Comic character from the X-Men series. He was voted #1 in the top 200 Comic Book characters of all time, as reported by Wizard Magazine in May, 2008.

Often called "Logan" by his friends, he is a mutant who possesses the ability to regenerate damaged or destroyed areas of his cellular structure at a rate far greater than that of an ordinary human. In addition, Wolverine’s healing factor provides him with an extended lifespan by slowing the effects of the aging process. Although over a century old, Wolverine is as healthy and physically fit as a man in his prime.

Wolverine also possesses superhumanly acute senses, making him capable of seeing things at a maximum distance greater than a normal human’s. His hearing is enhanced in a similar manner, and he is able to recognize people and objects by scent,

Wolverine’s skeleton includes six retractable one-foot long bone claws, three in each arm, that are housed beneath the skin and muscle of his forearms. Wolverine can, at will, release these slightly curved claws through his skin beneath the knuckles on each hand. The skin between the knuckles tears and bleeds, but the blood loss is quickly halted by his healing factor. Wolverine’s entire skeletal structure, including his claws, has been artificially bonded to the nearly indestructible metal Adamantium. As a result, Wolverine’s bones are virtually unbreakable, and his claws are capable of cutting through almost any substance.

Enjoy this trailer for the movie "X-Men Origins: Wolverine", released May 1, 2009