It’s declarative: React uses a declarative paradigm that makes it easier to reason about your application. It’s efficient: React computes the minimal set of changes necessary to keep your DOM up-to-date. And it’s flexible: React works with the libraries and frameworks that you already know.
Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it’s easy to try it out on a small feature in an existing project.
React uses a virtual DOM diff implementation for ultra-high performance. It can also render on the server using Node.js — no heavy browser DOM required.
React implements one-way reactive data flow which reduces boilerplate and is easier to reason about than traditional data binding.