Hobbits, also known as Halflings, were an ancient mortal race that lived in Middle-earth. Although their exact origins are unknown, they were initially found in the northern regions of Middle-earth and below the Vales of Anduin.
Orcs were the primary soldiers of the Dark Lords' armies and the most common of their servants. They were conceived of by Morgoth during the Years of the Lamps, serving him and later his successor, Sauron, in their quest to dominate Middle-earth.
The Elves, were the first and eldest of the Children of Ilúvatar, considered the fairest and wisest of the earthly race of Arda. Elves were immune to illness and not subject to age after reaching their prime. They could be killed only in violence or by extreme despair.
