We'll start by familiarizing ourselves with a fundamental React terminology. It will help us build a clear picture of what the React library is made of. This terminology will most likely update over time, so keep an eye on the official documentation at http://facebook.github.io/react/docs/glossary.html.
Just like the DOM is a tree of nodes, React's virtual DOM is a tree of React nodes. One of the core types in React is called
ReactNode. It's a building block for a virtual DOM, and it can be any one of these core types:
ReactElement: This is the primary type in React. It's a light, stateless, immutable, virtual representation of a DOM
ReactText: This is a string or a number. It represents textual content ...