Machine Learning
Artificial Intelligence (AI) is an umbrella term that contains a number of categories, such as Machine Learning, Robotics, Computer Vision. Broadly, it refers to developing computer applications that mimic human intelligence, such as decision making, text processing, and visual perception.
Machine learning is the study of computer algorithms that allow computer programs to automatiically improve through experience
Tom Michell, Machine Learning, McGraw Hill, 1997
Machine Learning is a branch of AI that enables machines to improve at performing a certain task by repeatedly trying that task, evaluating their performance and improving with experience.