This post is yet another mini tutorial about MultiLayer Perceptron (MLP), backpropagation gradient techniques techniques. The percetion is the most important unit in a Neural Network. Understanding how this unit works, garantees the understanding a bigger Neural Network. We will describe the working a neuron in a MLP. The history why Artificial Neural Networks can be found everywhere online, but a great paper I would advise would be this one Gradient-Based Learning Applied to Document Recognition.