Building Deep Learning models without callbacks is like driving a car with no functioning brakes -- you have little to no control over the whole process that is very likely to result in a disaster. In this article, you will learn how to monitor and improve your Deep Learning models using Keras callbacks like ModelCheckpoint and EarlyStopping. A callback is a set of functions to be applied at given stages of the training procedure. You can use callbacks to get a view on internal states and statistics of the model during training. You define and use a callback when you want to automate some tasks after every training/epoch that help you have controls over the training process.