The key difference between monkey and chimpanzee is that most monkey species have a tail while chimpanzee does not have a tail.
Monkey and chimpanzee are two primates. They have similarities as well as differences even though they belong to the same primate group. However, in an evolutionary aspect, chimpanzees show more closeness to humans than monkeys. Moreover, the larger brain capacity in both these animals has made them very intelligent and tactful in finding food and shelter to live. However, there is a distinct difference between moneky and chimpanzee in terms of various characteristics, such as body form and postures.