Flutter is an open-source UI software development kit created by Google. It is used to develop cross platform applications for Android, iOS, Linux, Mac, Windows, Google Fuchsia, Web platform, and the web from a single codebase. First described in 2015, Flutter was released in May 2017.Flutter is an open-source, cross-platform toolkit used for building apps for mobile OS, web, and desktop with the same code base. That means developers write code once and apply it to all the platforms – iOS, Android, web platform, macOS (Windows and Linux are still under development), and even Wear OS.

Flutter consists of two important parts:

An SDK (Software Development Kit): A collection of tools that are going to help you develop your applications. This includes tools to compile your code into native machine code (code for iOS and Android).
A Framework (UI Library based on widgets): A collection of reusable UI elements (buttons, text inputs, sliders, and so on) that you can personalize for your own needs.

To develop with Flutter, you will use a programming language called Dart. The language was created by Google in October 2011, but it has improved a lot over these past years. Dart focuses on front-end development, and you can use it to create mobile and web applications. If you know a bit of programming, Dart is a typed object programming language. You can compare Dart’s syntax to JavaScript.