CRUD is a mechanism that allows modern web applications to manage large datasets effectively by providing operations such as Create, Read, Update, and Delete, which enable users to manipulate and interact with data from the application. A React CRUD application allows users to create data, read data based on search queries, easily modify data through the update operation, and delete the data when not needed. The library of React is used in conjunction with a database to manage user input and store it securely. In this guide, we'll learn how to set up a React CRUD environment using create-react-app and JSON Server for our back-end API. We'll also explore the different operations such as Create, Read, Update, and Delete, their respective HTTP protocols, and best practices for using CRUD. By following this tutorial, you can build a simple shopping list application that demonstrates the power of CRUD in modern web development.