The document is a glossary of deep learning terms from A-Z published by Re-Work, defining important concepts like artificial neural networks, convolutional neural networks, deep learning, embeddings, feedforward networks, generative adversarial networks, and more; each term includes a short definition and links to external sources for further explanation. The glossary aims to explain the key concepts underlying recent advances in deep learning that have enabled applications such as driverless cars, healthcare, and fashion recommendations.