Flask is Python’s web framework that provides you tools, libraries, and technologies to rapidly build smart web applications. Flask is an open-source tool and is part of the Microframeworks (Backend) category in the tech stack. Micro-framework is common frameworks with little to no dependencies on external libraries; they are light; there are few dependencies to update and watch for security bugs. This framework develops web applications, and these can be some web pages, a blog, a wiki, or go as big as a web-based calendar application or a commercial website.

Flask, dependencies are:

Werkzeug, a WSGI utility library: WSGI is basically a protocol that defines Python applications to communicate with a web-server and thus used as web-application outside of CGI.

Jinja2, Flask template engine: Using template engines can quickly fix the issue of writing the same code/text multiple times, with this you can keep website style & layout consistent over all the web pages, and if in case you require a change, you only have to update it once. Template Engine saves you a lot of time when creating your application and helps update and maintain it.

Pros of Flask 

• Easy to set up and get it going
• Lightweight & Open source
• Easy code & Documentation
• Simple to use and Well designed
• Easy to get started and Flexible
• Quick to develop and easy to maintain applications
• Customizable, Powerful & Expressive
• Perfect for small to large projects with superb docs
• Flask Easy integration with some popular tools Python, Sentry, Bugsnag, Airbrake, etc 

Top companies reportedly use Flask in their tech stacks are

• Netflix
• Reddit
• Lyft
• Trivago
• Patreon

There are two most popular and best Python frameworks; Flask and Django which are widely used and suitable for the rapid development of web apps in the fastest time possible. Flask’s simplicity also allows experienced developers to create smaller apps in short timeframes and offers more flexibility in terms of customization. It focused on simplicity, minimalism, and fine-grained control. It implements the bare minimum, leaving the developer with complete freedom of choice in terms of modules and add-ons.

Conclusion

The main thing to remember when choosing a framework is that they are not a one-size-fits-all project solution. Consider the size of the app you wish to build plus plans for future growth, how much customization will be required, and the type of app you are making. The structure of your app may dictate which framework you should use. If you need particular tools and libraries or want a highly customizable framework, Flask will be the best choice and more suited to smaller, less complicated applications. Flask is flexible and highly extensible; you will need to be prepared to create the most functionality yourself.

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