Windows Embedded is a family of operating systems that are designed to be used in specialized devices, such as ATMs, medical devices, point-of-sale terminals, and industrial equipment. They are highly customizable and can be tailored to meet specific needs of the device or application. Some versions of Windows Embedded also include features for real-time processing, remote management, and security. This specialized skill is often required for developers and engineers involved in building and maintaining these types of devices.