Dedicated computer is Which is assigned one and only one task.
A dedicated server is a single computer in a network reserved for serving the needs of the network. For example, some networks require that one computer be set aside to manage communications between all the other computers. A dedicated server could also be a computer that manages printer resources.
A dedicated system is a computer system capable of performing 1 specific task an embedded system is a computer system within a larger system that performs a specific task.
An embedded system is a programmed controlling and operating system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints. It is embedded as part of a complete device often including hardware and mechanical parts.