A computer network refers to an interconnected group of computers. The networks may be classified according to the network layer at which they function depending upon the basic reference models. The reference models may differ from industry to industry, just like the five-layer Internet Protocol Suite model.

Computer Networks are classified on the basis of various factors like scale, connection method, network relationships and protocol.

With the boom of technology and e-commerce, most of the small and large businesses today are driven by the use of internet. The Internet and the influence that it has on e-commerce and business has in more than one ways become the "great equalizer" of small business and the larger corporate giants.