Among the many jobs that use electronics are electrician, engineer, programmer, and semiconductor designer. Many people in non-technical jobs may want to understand the fundamentals of electronics so that they have a knowledge of what their clients or co-workers do on the job. Others may want to be doing direct work on electronic device design, debugging, or embedded system design. The number of careers that use some aspect of electronics is increasing as electronic devices become more widespread. There are more people who need to be able to design and optimize electronic systems and more people who need to feel comfortable with the technologies underlying them.