Summary  
This chapter covers installing an external JavaScript library into a React project using npm and verifying the addition by inspecting the project’s dependencies in package.json.

General domain of usage  
Client-side routing in single-page web applications

## Installation
To begin utilizing the **React Router** library, we first need to install it in our project using a package manager such as npm or yarn. Open the terminal in the project directory and execute the following command:
Using npm:
```bash
npm install react-router-dom
```

## Checking Installation
Now that we've installed the `react-router-dom` package, let's verify that it has been added to our project successfully. To do this, we'll examine the `package.json` file, which lists the project's dependencies.

By default, the dependencies object in `package.json` includes only the packages required for running and setting up a plain React project. It may look something like this:
```js
"dependencies": {
  "@testing-library/jest-dom": "^5.16.5",
  "@testing-library/react": "^13.4.0",
  "@testing-library/user-event": "^13.5.0",
  "react": "^18.2.0",
  "react-dom": "^18.2.0",
  "react-scripts": "5.0.1",
  "web-vitals": "^2.1.4"
},
```
After adding the `react-router-dom` package, you should observe a modified dependencies object with the `react-router-dom` package included (as shown in line 7):
```js
"dependencies": {
  "@testing-library/jest-dom": "^5.16.5",
  "@testing-library/react": "^13.4.0",
  "@testing-library/user-event": "^13.5.0",
  "react": "^18.2.0",
  "react-dom": "^18.2.0",
  "react-router-dom": "^6.13.0",
  "react-scripts": "5.0.1",
  "web-vitals": "^2.1.4"
},
```

Which package is necessary to install to use the React Router library?

Learn to manage navigation in React applications using React Router. Understand the structure of URLs and the role of routing in web apps. Set up React Router to create multi-page applications with dynamic content based on URL paths. Work with advanced features like query strings and URL parameters to handle application state and user navigation.

Learn the theoretical basics of concepts such as URL, domain, protocol, query parameters, and more. Understand the significance of routing in web applications and why we need the React Router library.

Discover how to create an entire React application from scratch, with the ability to display content that adapts based on the URL using React Router functionality.

Explore using query strings for sharing and managing application state via URLs, work with different data types in query parameters, and leverage React Router for navigation and effects based on URL changes.

Installing React Router

Installation

Checking Installation