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Flask is a micro web framework used for building web applications. It's called "micro" because it keeps things simple and only provides the basics you need to get started, but also offers the flexibility to scale up for larger projects if necessary. Flask is written in Python and follows its standards, so developers can build using familiar tools and libraries. The framework supports extensions — known as Flask extensions — that add additional features as needed without bloating the core framework. This makes it easy to customize applications while keeping them relatively lightweight.

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