A human is intelligent, and is born with intelligent instincts which are the processes already defined in DNA. After being born, a human will learn more knowledge using some predefined learning mechanism.
Instincts: Predefined processes for results.
Natural learning: Predefined processes for learning.
Machine instincts are defined by algorithms with logics created by human. Machine learning is the process of learning and improving on statistical data.
Instincts: Regular algorithms with logics defined by human.
Machine learning: Learning algorithms with the mechanism to simulate biology, or just the mathematical way.