A microprocessor -- also known as a CPU or central 
processing unit -- is a complete computation engine that is 
fabricated on a single chip. The first microprocessor was 
the Intel 4004, introduced in 1971. The 4004 was not very 
powerful -- all it could do was add and subtract, and it 
could only do that 4 bits at a time. But it was amazing 
that everything was on one chip. Prior to the 4004, 
engineers built computers either from collections of chips 
or from discrete components (transistors wired one at a 
time). The 4004 powered one of the first portable 
electronic calculators. 
        A chip is also called an integrated circuit. 
Generally it is a small, thin piece of silicon onto which 
the transistors making up the microprocessor have been 
etched. A chip might be as large as an inch on a side and 
can contain tens of millions of transistors. Simpler 
processors might consist of a few thousand transistors 
etched onto a chip just a few millimeters square.

microprocessor is a programmable device that has computing 
and decision making capability.

Microprocessor is a program-controlled device, which 
fetches the instructions from memory, decodes and executes 
the instructions. Most Micro Processor are single- chip 
devices.

microprocessor is a programmable device that performs
arithmetic operations and it has decision making capability.
it works in by binary on machine language(HEXCODE).

microprocessor is nothing bun it is electronics & decision 
making device. it can calculate very fast without any 
mistake. it is controls to all parts of coputer.