Science is the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
Technology is the application of scientific knowledge for practical purposes, especially in industry.
Engineering is the branch of science and technology concerned with the design, building, and use of engines, machines, and structures.
Mathmatics are the abstract science of number, quantity, and space. Mathematics may be studied in its own right ( pure mathematics ), or as it is applied to other disciplines such as physics and engineering.