Is Flask a Web Server or Framework?


Angela Bailey

Is Flask a Web Server or Framework?

When it comes to web development, there are many different tools and technologies to choose from. One of the most popular options is Flask, but there is often confusion about whether Flask is a web server or a framework. In this article, we will delve into this topic and provide a clear understanding of what Flask really is.

Understanding Flask

Flask is a micro web framework written in Python. It is designed to be simple and lightweight, making it ideal for small to medium-sized applications. While Flask provides some basic functionalities for building web applications, it is not considered a full-fledged web server.

Flask as a Web Framework

Flask acts as a web framework by providing developers with the necessary tools and libraries to build robust web applications. It offers features like routing, request handling, and template rendering. These features allow developers to define URL endpoints, handle incoming requests, and generate dynamic HTML content.

One of the key advantages of using Flask as a web framework is its flexibility. It allows developers to pick and choose the components they need for their specific application requirements. This modular approach makes it easy to create custom solutions tailored to individual needs.

The Role of Web Servers

A web server, on the other hand, is responsible for managing incoming requests from clients and serving static files or dynamically generated content in response. Examples of popular web servers include Apache HTTP Server and Nginx.

In the case of Flask, it relies on a separate web server to handle incoming requests while it focuses on providing the necessary tools for building the application itself. When deploying a Flask application in production, you typically use WSGI servers like Gunicorn or uWSGI to handle the web server responsibilities.


In conclusion, Flask is a web framework that provides developers with the tools and libraries needed to build web applications. It is not a web server itself but relies on other servers, such as WSGI servers, to handle the actual web server functionalities.

Understanding this distinction is crucial for developers starting with Flask. By recognizing Flask’s role as a web framework, developers can effectively leverage its features and build powerful applications while relying on appropriate web servers for deployment.

  • Flask is a lightweight and flexible web framework
  • It provides tools for routing, request handling, and template rendering
  • A separate web server is needed to handle incoming requests
  • WSGI servers like Gunicorn or uWSGI are commonly used with Flask

By grasping these concepts, developers can make informed decisions when choosing the right technologies for their next web development project. Flask offers a fantastic balance between simplicity and functionality, making it a popular choice among Python developers.

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