Apes are not monkeys (monkeys have tails). In general primate is a very large group that includes lemurs and tarsiers.

I just had to google this. Thanks! I guess I never really questioned (learnt?) it and thought monkey/ape was interchangeable.

Apes are also primates, but not monkeys. So for example, the rest of the great apes (orangutans, gorillas, chimps).

Primates are monkeys. A monkeys isn't necessarily primate.

You have that backwards.

Doh! My mistake.

Nope.