Electrical engineering is the most populated of the engineering disciplines. They specialize in computer technology.
Much of what computer and electrical engineers do overlap. Computer engineering is similar to computer science, yet is distinct from it. Both fields are extensively involved with the design and development of software.
Mechanical engineering is one of the largest and broadest engineering disciplines. It is second only to electrical engineering in number of engineers employed. Mechanical engineers work with machines and mechanical devices. They are also involved in the design, development, production, control, operation, and service of the devices.