To procreate is to reproduce. In other words, to procreate is a more formal way of saying "making babies."
Notice the word create in procreate? That's a clue that this word is about making something, in this case, making more creatures. People procreate by having sex and then children. Birds procreate when they lay eggs. Plants procreate asexually — without sex. Sometimes it's difficult to convince pandas to procreate in zoos. All forms of procreating result in more critters like the originals. Your parents procreated, or you wouldn't be here.