This document provides an introduction to deep learning, including common network architectures and use cases. It defines artificial intelligence, machine learning, and deep learning. It discusses how neural networks are trained using stochastic gradient descent and backpropagation to minimize loss and optimize weights. Common network types are described, such as convolutional neural networks for image recognition and LSTM networks for sequence prediction. Examples of deep learning applications include machine translation, object detection, segmentation, and generation of images, text, and video. Resources for learning more about deep learning are provided.