Engineering involves applying scientific and mathematical principles to solve problems through design and construction. It uses the engineering design process which consists of 8 steps: identifying the problem, researching the problem, developing solutions, selecting the best solution, constructing a prototype, testing and evaluating solutions, communicating solutions, and redesigning if needed. There are many fields of engineering including aerospace, biomedical, civil, electrical, and mechanical engineering. Engineers design and develop new products, use science and math principles, conduct tests, create and build things, and solve problems.