Answer: 
Embedded system is defined as, it is the combination of between hardware and software which performed various specific tasks. It is a dedicated functions which contain large electrical and mechanical components. Basically it is the real time computing constraint. 
Example: Printers, washing machine and automobiles.
Characteristics of embedded system are: 
- It is performed single function and specific operations. 
 - It is based on microprocessor and micro controller.
 - Software are used for flexibility and good features and hardware are used for the security purpose and better performance.