Machine Learning (ML) is the study of computer algorithms that improve automatically through experience and by the use of data. 1) It is seen as a part of Artificial Intelligence (AI). Machine learning algorithms build a model based on sample data, known as “training data”, in order to make predictions or decisions without being explicitly programmed to do so.2) Machine learning algorithms are used in a wide variety of applications, such as in medicine, email filtering, and computer vision, where it is difficult or unfeasible to develop conventional algorithms to perform the needed tasks.3)
Source: https://en.wikipedia.org/wiki/Glossary_of_artificial_intelligence