What is wrong description or backpropagation?

The learning process or the backpropagation algorithm consists of a forward propagation process and a back-propagation process.

The backpropagation algorithm is a learning algorithm suitable for multi-layer neural networks, which is based on the gradient descent method

The backpropagation phase sends training inputs to the network to obtain an stimuli response

until the response of the network to the input reaches the predetermined target range.