Oracle Autonomous Database is a cloud-based database service that automates many of the routine tasks associated with database management. It uses machine learning to optimize performance, security, and availability, allowing users to focus on their applications rather than database maintenance. This service offers two main deployment options: Autonomous Transaction Processing for transaction-heavy applications and Autonomous Data Warehouse for analytical workloads. By automating tasks like patching, backups, and scaling, it helps organizations reduce operational costs and improve efficiency while ensuring high levels of reliability and security.