Machine learning is a subject that reviews how to utilize PCs to reenact human learning exercises, and to think about self-change techniques for PCs that to get new information and new abilities, distinguish existing learning, and persistently enhance the execution and accomplishment. Contrasted with human learning, machine learning adapts speedier, the collection of information is more encourage the consequences of learning spread simpler. In this way, any advance of human in the field of machine learning will improve the ability of a computer, along these lines affect human culture. This paper introduces machine learning, its basic model, and various techniques. This paper also discusses various researches done in previous years in the field of machine learning.