An HTTP client is a software application or tool that enables users to send requests to a web server and receive responses. It communicates using the Hypertext Transfer Protocol (HTTP), which is the foundation of data exchange on the World Wide Web. Common examples of HTTP clients include web browsers like Google Chrome and Mozilla Firefox, as well as command-line tools like cURL. HTTP clients can perform various actions, such as retrieving web pages, submitting forms, and downloading files. They handle different types of requests, including GET and POST, allowing users to interact with web services and APIs effectively. This functionality is essential for accessing online content and services.