Answer:
Back propagation is the algorithm which is basically used o improve the accuracy in the machine leaning and data mining. It is one of the most important tool in the mathematics to check the prediction with high accuracy.
The back propagation is also known as backward propagation and it is mainly used in the ANN (Artificial neural network).
The important features of the back propagation is that it has high efficiency for improving the networks. It is also recursive and iterative methods and ability to perform various tasks.