Microprocessor system

Microprocessors are powerful pieces of hardware, but not much useful on their own.  
They do not have the sense of their own.  Like the human sample it needs some
instructions inputs and outputs to process some task. As per instruction given to the
microprocessor.
A microprocessor system is microprocessor plus all the components it requires to do a
certain task.
Shortly, a microprocessor needs help of some components to make up the task to fulfill.
These components are input, output, storage, and memory. All these components and
microprocessor make up a microprocessor system.
Personal Computer is an example of microprocessor System. Another example is the
microcontroller.