Every web application is different, like a piece of handcrafted furniture. You will rarely find a mass-produced sofa meeting all your needs perfectly. Even if you start with a basic requirement, such as a blog or social network, your needs will slowly grow, and you can easily end up with a lot of half-baked solutions duct-taped onto a once simple cookie cutter solution.
This is why web frameworks, such as Django or Rails, have become extremely popular. Frameworks speed up development and have all the best practices baked in. However, they are also flexible enough to give you access to just enough plumbing for the job. Today, web frameworks are ubiquitous, and most programming languages have at least one end-to-end framework similar to Django.
Python probably has more web frameworks than most programming languages. A quick look at Python Package Index (PyPI) brings up an amazing 13,045 packages related to web environments. For Django, the total is 9,091 packages. The Python wiki lists over 54 active web frameworks with the most popular ones being Django, Flask, Pyramid, and Zope. Python also has a wide diversity in frameworks. The compact bottle micro web-framework is just one Python file that has no dependencies and is surprisingly capable of creating a simple web application.
Despite these abundant options, Django has emerged as a big favorite by a wide margin. Djangosites.org lists over 5,263 sites written in Django, including famous success stories such as Instagram, Pinterest, and Disqus. As the official description says, Django (https://djangoproject.com) is a high-level Python web framework that encourages rapid development and clean, pragmatic design. In other words, it is a complete web framework with batteries included just like Python.
The out-of-the-box admin interface, one of Django's unique features, is extremely helpful for early data entry and administration. Django's documentation has been praised for being extremely well-written for an open source project.
Finally, Django has been battle-tested in several high traffic websites. It has an exceptionally sharp focus on security with protection against common attacks such as Cross-site scripting (XSS), Cross-site request forgery (CSRF) to evolving security threats such as weak password hashing algorithms.
Although you can use Django to build any kind of web application in theory, it might not be the best for every use case. For example, to prototype a simple web service in an embedded system with tight memory constraints, you might want to use Flask, while you might eventually move to Django for its robustness and features. Choose the right tool for the job.
Some of the built-in features, such as the admin interface, might sound odd if you are used to other web frameworks. To understand the design of Django, let's find out how it came into being.