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From Biology to Computing
Neural Networks in 3 Minutes Alex J. Champandard This is a brief overview of Artificial Neural Networks in plain english, which will take about 3 minutes of your time. So lets get straight to business! Neurons
Human and animal brains are large collections of inter-connected neurons. Neurons are complex cells that communicate together in elaborate patterns. 
The dendritic tree collects stimuli from surrounding neurons, causing the body to react. In some cases it sends an electrical impulse down the axon. This spike will then in turn stimulate dentrites of neighbouring neurons. 
Our attempts to understand how the human brain works includes artificially simulating it, from whence came the need for a simple mathematical model of a neuron. These neurons need to be connected together to do something useful. 
TopologiesThere are various possible layouts for a specific number of neurons, this is called the topology of the network. Some are more 'realistic' representations of biological neural networks, and some have advantages for solving specific problems in computer science. Types
Varieties
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