A web browser is a software application for accessing information on the World Wide Web. When a user requests a web page from a particular website, the browser retrieves the necessary content from a web server and then displays the page on the user's device. Browsers interpret HTML and other web languages, rendering the text, images, and other elements of web pages. Modern browsers also support various features like tabbed browsing, extensions, and privacy tools. They are essential tools for navigating the internet, with popular examples including Google Chrome, Mozilla Firefox, and Safari.