From the LotR.Fandom article on Orcs:
Before Oromë first found the Elves at Cuiviénen, Melkor kidnapped some of them and cruelly tortured them, twisting them into the first Orcs.
From the LotR.Fandom article on Elves:
Elves are (generally) unusually beautiful in face and body. There is little physical difference between males and females except that which is required for reproduction. They have far better vision and hearing than Men. They also have skills and abilities beyond what is possible for Men, and many can craft seemingly magical objects. In The Silmarillion, it is mentioned that the Elves are indeed closest in kin to the Ainur, given that Elves possess ethereal grace and various powers. Elves are light of foot, can travel long distances without leaving tracks, and often can walk lightly across snow where the boots of Men would sink. They do not require sleep, but are able to enter a waking meditative state to regain their strength which means they can be exhausted and tire. Although the Elves are more resistant to adverse environments and lack of food than Men, they can succumb to them thus Elves do require sustenance.