The FormADF App is a standalone ADF application that allows users to import existing Oracle Forms and Reports into a new ADF framework. It provides features such as navigation, user administration, and running both new ADF forms and existing Forms and Reports. Using the FormADF App allows for a transitional migration approach where users can start using the new ADF application immediately while existing functionality is migrated incrementally. It aims to reduce costs and risks compared to building a new ADF application from scratch.