React has been revolutionary in the world of web app development for its ability to render components and churn out highly complex platforms at lightning speed.
Although initially intended to build components for websites (such as buttons and text) - Reacts capabilities have grown into an entire ecosystem of functions, from building mobile applications using React Native, generating static sites with Gatsby to creating virtual realities. Moving away from heavier frameworks, the lightweight library of React was intentionally built for agility and speed. You can implement React into existing applications then begin to convert into React.js.