Drupal is an open-source content management system that allows anyone to download, use, modify, and share the software. It aims to develop a leading content management system using best practices in community publishing, knowledge management, and software design. Key values include flexibility, simplicity, teamwork, innovation, modularity, and maintainability. Drupal 8 is one of the best open source platforms for large websites with high traffic that may include e-commerce and different content types.