The document provides an overview of the machine learning, artificial intelligence, and data (MAD) landscape in 2021. It maps out categories of companies and technologies across the MAD ecosystem, including areas like finance & investing, incubators & schools, data resources, machine learning platforms, computer vision, natural language processing, analytics infrastructure, databases, and applications across various industries. The landscape contains over 250 categories with thousands of companies and open source projects mapped within the MAD field.