What is a Flask Blueprint, and why would you use it?

Instruction: Define what a Blueprint is in Flask and provide scenarios where it's beneficial.

Context: This question tests the candidate's understanding of Flask Blueprints and their ability to modularize a Flask application.

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A Blueprint records routes and related setup that are registered on a Flask application. It helps organize a feature or reusable component; it is not an independently running application or a security boundary.

This complete Flask3.1 example registers a public catalog route:...

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