Monkeys have hair not fur. This a quality of all primates, which is a group of mammals that includes monkeys, prosimians, apes and humans.
The hair on a monkey acts as an insulator and helps regulate the animal's body temperature, allowing it to maintain a comfortable temperature in the shade, a trait called thermoregulation, which includes the presence of sweat glands that assist in cooling the mammal. Additionally, a few of the other identifying features of monkeys and primates in general are fingernails instead of claws, opposable thumbs and padded fingertips with fingerprints. Monkeys are found across Asia, South America, Central America and Africa.