Oracle Application Framework (OAF) is a widely-used development framework for building Oracle applications. It is an extensible platform that allows developers to easily create customized user interfaces, business logic, and data access layers within Oracle E-Business Suite (EBS) applications. OAF is based on the Model View Controller (MVC) architecture and offers a set of pre-built components, libraries, and tools to simplify and speed up application development. Some of the key features of OAF include its flexibility, scalability, and ability to leverage existing EBS modules and data structures.