The `exec_` method in `qgis.core.QgsApplication` is used to start the execution of the QGIS application. It initializes the necessary components of the application and enters the main event loop, where it handles user input and events. This method is typically called after setting up the required settings and plugins for the application. It allows the user to interact with the QGIS software by providing access to various functionalities, such as opening, editing, and analyzing geographic data.
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