What is the react programming language ?

Question

I'm heard about it that it a very high level programming language which is used as making frame work of a web or something.

Answer 1

React is not a language, it's a library for the construction of UIs. Currently it is highly used for web development and for the development of multiplatform applications (through the React Native framework you can make apps for Android & IOS).

Here I leave you a little more information:
https://reactjs.org/docs/hello-world.html
https://facebook.github.io/react-native/