Embedded system.

An embedded system is a computer system that is designed to perform specific tasks and is completely enclosed in the device it is operating. Some examples include bank automated teller machines (ATMs), calculators, digital cameras, printers, programmable thermostats, video games, antilock brake systems in cars, and computerized toys. Unlike the system in a desktop or laptop computer, an embedded system generally has no peripheral devices such as separate screens, keyboards, etc. This definition is being stretched at times as some embedded system devices, such as cell phones, electronic tablets, and other handheld computer devices, become expandable. However, the way these systems are designed keeps them within the realm of embedded systems.