Flutter is Google’s new portable UI toolkit for building beautiful, natively-compiled applications for mobile, web, and desktop from a single codebase.
Flutter is like any other framework, developed in DART (an object-oriented and class defined language). It is a client-optimized programming language for building fast apps on multiple platforms (Mobile, Desktop, Backend, and Web Applications), making it a one-in-all power-packed framework.

Google’s revolutionary new Fuchsia would be utilizing Flutter 1.7 to develop apps on its platform. Google describes this cross-platform application development SDK beautifully through its tagline – “Beautiful native apps in record time”. Flutter enables fast development through its expressive and flexible UI to boost native app performance.