What exactly does it convey when a cat kneads you?

Cats are enigmatic animals that frequently act strangely. Although it may seem unusual, our feline pals regularly engage in kneading. Some cats prefer "making biscuits" more than others as well, and they will slobber and glaze around while they knead your lap or a soft blanket. What are cats doing when they knead, given that they aren't known for their baking abilities? This peculiar behavior is explained by a number of theories.