"Artificial neural network (ANN) is a computational model that consists of several processing elements that receive inputs and deliver outputs based on their predefined activation functions"
Artificial Neural Networks (ANN) are models that are developed which attempts to emulate the human brain. The strucutre of an ANN is similar to a nervous system. It consists of a input layer, hidden layer(s) and an output layer.
The most widely used ANN is multi-level perceptron (MLP) model. Other models include Self-Organizing maps, Radial basis function networks, etc.
Source: Eshragh F, Pooyandeh M, Marceau D, Journal of Environmental Management (2015) https://doi.org/10.1016/j.jenvman.2015.07.051