# A Three-Layer Example: Working on the Input Layer

Learn about a three-layered neural network, its different layers, and how to calculate input to the input layer.

## We'll cover the following

## Three-layered neural network

We haven’t worked through feeding signals through a neural network using matrices to do the calculations. We also haven’t worked through an example with more than two layers, which is relevant because we need to see how we treat the outputs of the middle layer as inputs to the final third layer.

The following diagram shows an example neural network with three layers, each with three nodes. To keep the diagram clear, not all the weights are marked.

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