The `getFlashBag` method is a part of the `Session` class in the PHP Symfony\Component\HttpFoundation\Session namespace.
This method is used to retrieve the flash bag associated with the session. A flash bag is a collection of flash messages that are meant to be displayed to the user for a single request and then automatically removed.
Flash messages are typically used to provide feedback or notifications to the user after an action has been completed. They are stored in the session for a short duration and can be accessed and displayed in the next request.
By using the `getFlashBag` method, developers can access the flash bag object and retrieve the flash messages stored within it. These messages can then be rendered to the user in a consistent and user-friendly manner.
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