The primary function of a web browser is to retrieve, present, and navigate information on the World Wide Web. Browsers interpret HTML and other web technologies, displaying them as visual pages for users. They enable connectivity to web servers, allowing users to access websites and content. Additionally, browsers provide features like bookmarking, browsing history, and add-ons to enhance user experience. Popular web browsers include Google Chrome, Mozilla Firefox, and Safari, each offering unique tools and privacy features.