What Do Engineers Do?

Engineers apply the theories and principles of science and mathematics to economical solution of pratical technical problems and they design all kinds of functional systems, products and services for modern living by applying a combination of mathematical, scientific and engineering fundamentals.Engineers solve problems and get things better , more efficiently and cheap.Engineers ensure that the products they manufacture are of the highest quality and meet safety standards.Engineering managers are distinguished from other managers by the fact that they possess both an ability to apply engineering principles as well as being able to organize, plan and manage technical projects.
In addition engineers not only contribute to modern technology but also to other fields including architecture, the global environment and medicine.

http://appsci.queensu.ca/prospective/engineering/info/
http://www.eng.nus.edu.sg/ugrad/prospective/engdo.html
http://www.teachingtools.com/Slinky/engineers.html