What is microprocessor?

1. Known as Central Processing Unit (CPU), it is the brain of all computers and electronic devices

Microprocessor is an IC that has only a CPU inside. It does not have any peripherials attched to it (memory, IOs,...). It is used only for processing purposes and not for controlling.   

is a component present in many electronic devices that executes the machine instructions of the computer program

A microprocessor is basically a CPU of a computer that incorporates the functions of a computer on a single integrated circuit (IC).