Oracle Application Development Framework (ADF) is a Java-based framework used for developing enterprise applications. It provides developers with a comprehensive and unified framework to build applications across a wide range of technologies, including Java EE, Web services, and XML. ADF is designed to be easy to use and provides a number of features to help developers increase productivity and reduce development time, such as visual development tools and pre-built components. ADF also integrates with Oracle Fusion Middleware to provide a complete solution for building enterprise applications.