Primate is an order bifurcated into prosimians and simians (aka anthropoids). Prosimians include lemurs, bushbabies, and tarsiers, among others.
Simians include monkeys, apes, and humans. Among simians, only monkeys have tails. 264 monkey species are known.
One salient characteristic shared by all primates is a prolonged childhood. Though particulars vary as to caretakers beyond mothering, all primates practice extensive parental care.
The intellectual benefit of parenting is education, termed social learning. All young primates learn a variety of skills from their elders, with mom as primary teacher.