Hey Pratibha, Application Modeller is the embedded capability within Object Studio where the configuration to interact with UI elements of an application exist. These elements are identified by the bot with the help of selected element attributes, which can be configured and updated to make them unique for each element. The bot can then interact with these elements to perform operations over them.
It is used to interact with applications and there are different interfacing applications pre-configured in Application Modeller to make the RPA bot identify elements of external applications more effectively. These are: