In this course, we will learn about the Convolutional Neural Networks (CNN) in deep learning. Deep learning has been widely used in computer vision and other fields. The most core model is derived from the breakthrough development of convolutional neural networks. We will learn the principles of convolutional neural networks and use the TensorFlow open source framework to build convolutional neural networks. I hope that everyone can understand the mystery of the convolutional neural network through the study of this chapter.