What Is Flask Web Server?


Heather Bennett

What Is Flask Web Server?

Flask is a micro web framework written in Python that allows you to build web applications quickly and with ease. It is lightweight, flexible, and designed to be simple yet powerful. Flask follows the model-view-controller (MVC) architectural pattern, making it suitable for both small and large-scale projects.

Why Choose Flask?

There are several reasons why you might choose Flask as your web server:

  • Simplicity: Flask’s simplicity is one of its biggest advantages. It has a small and easy-to-understand codebase, making it a great choice for beginners or those who prefer minimalistic frameworks.
  • Flexibility: With Flask, you have the freedom to customize and extend the framework according to your specific needs.

    You can add or remove features as required, giving you complete control over your application.

  • Scalability: Although Flask is lightweight, it can handle complex applications with ease. It provides support for scaling up your application as it grows, ensuring that it remains performant even under heavy loads.

Getting Started with Flask

To get started with Flask, you’ll need to follow these steps:

  1. Create a Virtual Environment: It’s always recommended to create a virtual environment for your project. This isolates your project’s dependencies from other Python packages installed on your system.
  2. Install Flask: Once you have set up your virtual environment, you can install Flask using pip, the package installer for Python. Simply run the command $ pip install flask.
  3. Build Your Flask Application: Now it’s time to start building your Flask application.

    Create a new Python file and import the necessary modules and classes from the Flask package.

  4. Define Routes and Views: Routes determine how URLs are handled in your application, while views are functions that handle requests made to those URLs. Use decorators to define routes and associate them with view functions.
  5. Run Your Application: Finally, you can run your Flask application using the command $ flask run. By default, your application will be accessible at http://localhost:5000.


Flask is an excellent choice for building web applications due to its simplicity, flexibility, and scalability. With its easy-to-understand codebase and powerful features, you can quickly develop robust applications without sacrificing performance or control. Follow the steps outlined above to get started with Flask and unlock the potential of this fantastic web server.

Now that you have a better understanding of Flask, it’s time to dive in and start building your own web applications. Good luck!

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