Introduction

React is a UI library that helps us build single-page web and mobile applications. In single-page applications, the page is loaded only once. When the user interacts with the page, say, they click a button, the application will make a request to the server. When the page receives data from the server, it will only update the page partially without entirely reloading the page.

Since a single-page application has a lot of coding in one place, the code could get quite complex to manage. As we saw in the previous chapter, React allows us to split components into smaller pieces and helps in building reusable components with a consistent UI design.

Having reusable components means developers can use each component multiple times in their application as each component can be developed further separately and can contain its own business logic. It's much easier to test the individual smaller components as this will not bind any complex logic together.

While there...