A neural network can be defined as a model of reasioning 
based on the human brain.
The human brain incorporates nearly 10 billion neurons and 
60 trillion connections,Synapses,between them.
By using multiple neurons simultaneously,the brain can 
perform its functions much faster than the faster computers.

Although a single neuron has a very simple structure,an 
army of such elements constitutes a tremendous processing 
power.
The network which represents the connections among several 
neurons is called a neural network.