Introduction

• React is a JavaScript library for building user interfaces.
• React is used to build single-page applications.
• React allows us to create reusable UI components.

Virtual DOM

• React creates a VIRTUAL DOM in memory.
• Instead of manipulating the browser's DOM directly, React creates a virtual DOM in memory, where it does all the necessary manipulating, before making the changes in the browser DOM.
• React only changes what needs to be changed!