A neural network is an interconnected group of neurons. The prime examples are of course biological neural networks, especially the human brain. In modern usage, researchers often refer to an artificial neural network (ANN) simply as a neural network or neural net for short, and this is the sense that is used in the rest of this article until proper disambiguation is done.
A neural network is a mathematical or computational model for information processing based on a connectionist approach to computation. The original inspiration for the technique was from examination of bioelectrical networks in the brain formed by neurons and their synapses. In a neural network model, simple nodes (or "neurons", or "units") are connected together to form a network of nodes - hence the term "neural network".