React

React is a JavaScript library used in web development to create interactive elements on websites. While it is the most popular JavaScript framework on GitHub, it describes itself as a JavaScript library.

JavaScript is a scripting language used to create and control dynamic web content, such as animated graphics or interactive forms.

JavaScript libraries are collections of ready-made JavaScript code that can be used for common JS tasks, so you can avoid the time-consuming (and unnecessary) process of coding everything by hand.