The primary role of web browsers in internet usage is to retrieve, render, and display web content from the internet. Browsers interpret HTML, CSS, and JavaScript to present webpages visually, allowing users to interact with text, images, and multimedia. They facilitate navigation through URLs and manage data such as cookies and bookmarks. Additionally, web browsers enhance user experience through features like browsing history, tabbed browsing, and security measures like HTTPS for secure communication. Ultimately, browsers serve as the gateway for accessing online information and services.