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What are flask blueprints? Basically, a flask blueprint is a way for you to organize your flask application into smaller and re-usable application. Just like a normal flask application, a blueprint defines a collection of views, templates and static assets.

¶ A blueprint defines a collection of views, templates, static files and other elements that can be applied to an application.This blueprint would define the views for routes like /admin/login and /admin/dashboard. It may also include the templates and static files that will be served on those routes.

Flask uses a concept of blueprints for making application components and supporting common patterns within an application or across applications. Blueprints can greatly simplify how large applications work and provide a central means for Flask extensions to register operations on applications.

Technically, you don't need blueprints, you can just register each route on your create_app function.

A Flask blueprint helps you to create reusable instances of your application. It does so by organizing your project in modules. Those modules are then registered the main application. They help in creating an application factory.

Basically, a flask blueprint is a way for you to organize your flask application into smaller and re-usable application. Just like a normal flask application, a blueprint defines a collection of views, templates and static assets.

Each Flask Blueprint is an object that works very similarly to a Flask application. They both can have resources, such as static files, templates, and views that are associated with routes. However, a Flask Blueprint is not actually an application. It needs to be registered in an application before you can run it.