Engineering is the application of math and science to make things useful for people. Engineers solve problems to improve society through designing, building, and overseeing projects and systems. Some common engineering disciplines include mechanical, electrical, chemical, and civil engineering. Engineering careers offer high earning potential, with average salaries of engineers increasing by about 35% since 2000. College entrance requirements for engineering programs typically include courses in math, science, computer programming, and technical subjects. Cooperative education programs allow students to gain work experience and offset education costs by alternating periods of study and paid internships.