What is BackPropagation? Logic operation of Backpropagation Algorithm

Backpropagation is an algorithm used for training neural networks. When the word algorithm is used, it represents a set of mathematical- science formula mechanism that will help the system to understand better about the data, variables fed and the desired output. Backpropagation is a kind of method to train the neural network to learn itself and find the desired output set by the user. Neural networks are layers of networks arranged like to represent the human brain with weights (connecting one input to another). This arrangement of layers of inputs is called input neurons, they are followed by their successor called output neurons.