Instruction: Describe the role of Flask extensions and how they are integrated into a Flask application.
Context: This question tests the candidate's knowledge of Flask extensions and their impact on extending the functionality of a Flask application.
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Flask extensions are tools that allow developers to add specific functionalities to their Flask application without having to build those features from the ground up. These extensions are often developed to handle common tasks such as form validation, user authentication, database integration, and more. The beauty of Flask extensions is that they adhere to the Flask philosophy of keeping things simple and lightweight, yet they are powerful enough to dramatically extend the capabilities of a basic Flask application.
Integrating Flask extensions into an application is straightforward, thanks to the well-defined conventions provided by Flask. Typically, an extension is added by first installing it using a package manager like pip. Once installed, the extension can be...