There are over 300 species of primates in the world, but there are a couple of distinctive differences that separate apes from monkeys. Apes don't have tails and are generally a lot larger. They also depend more on their vision than their smell because their noses aren't snout-shaped like monkeys' noses are. Great Apes consist of gorillas, chimpanzees, oragutans and bonobos, while the Lesser Apes consist of gibbons and siamongs.
Bonus Fact: The amount of identical DNA in chimpanzees and humans range from 94.6% to 99.4%.