Science is knowledge attained through study or practice, or knowledge covering general truths of the operation of general laws, as obtained and tested through scientific method and concerned with the physical world. The word science comes from the latin word "scientia," meaning knowledge.
Science refers to a system of acquiring knowledge. This system uses observation and experimentation to describe and explain natural phenomena. The term science also refers to the organized body of knowledge people have gained using that system.
There are two major classifications of science: Natural sciences, the study of the natural world, and Social sciences, the systematic study of human behavior and society.