Flutter is a unique mobile app development framework because it allows developers to create high-performance, natively compiled apps for mobile, web, and desktop platforms from a single code base. Here are some of its key features like fast development, customizable widgets, cross-platform development, high-performance, open-source frameworks.
If you are interested in learning more about Flutter, then I would suggest that you watch this video tutorial by Intellipaat. This video has covered everything. Upon completion of this tutorial, you will have a better understanding of Flutter and be able to build your own simple applications.