An embedded system is a computer that has been built to solve only a few very specific problems and is not easily changed. In contrast, a general-purpose computer can do many different jobs, and can be changed at any time with new programs for new jobs.
It is also a specialized computer system that is part of a larger system or machine. Typically, an embedded system is housed on a single microprocessor board with the programs stored in ROM. Virtually all appliances that have a digital interface watches, microwaves, VCRs, embedded systems.
Some embedded systems include an operating system, but many are so specialized that the entire logic can be implemented as a single program.
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