The Cenobites are extradimensional beings who appear in the works of Clive Barker, including the novella The Hellbound Heart and the eight Hellraiser films. They are also mentioned, in passing, in the novel Weaveworld. They are mentioned by Immacolata, who calls them “The Surgeons from Beyond.”
They can reach Earth's reality through a puzzle box called the Lament Configuration.
The leader of the Cenobites is known as Pinhead.
Cenobites are known for their abilities of gifting human with unlimited experiences, pain and pleasure beyond imaginations. They also possess multiple supernatural abilities including invoking chains, teleportation (when they are summoned), giving people extra sensations (only seen in the novella) and many other extraordinary skills.
When one summon the cenobites by solving the Lament Configuration, cenobite will arrive the earth through the schism between the realities and bring take the victims back to their realm.
As for their origins, it is commonly acknowledged that they are transformed from human by hellish forces. Although this fact is never mentioned in the first film and the novella, the details of which is shown in the Hellbound: Hellraiser II and following comic.