Embedded systems can be defined as :
‘A system that has embedded software and hardware, that makes it a dedicated system for a specific application or a part of an application or product is called as an Embedded System.’
‘Embedded system is any system that has a microprocessor or a microcontroller embedded into the system to control the system’.
Embedded system is a combination of a computer hardware with the software to control, monitor, communicate or do multiple operations.
Examples: Mobile, Washing Machine, Microwave Oven as each one of them have a microprocessor or microcontroller in it to control the system.
They are designed to perform specific task, it generally uses microcontroller.
An Embedded system has hardware quite similar to a computer (usually no hard disk or secondary memory), but the OS of the embedded system is of a special type (mostly RTOS) and the other application software (that are also meant than the ones in the computer).