A browser is a software application that allows users to access and navigate the internet. It interprets and displays web pages, enabling users to view text, images, and videos. Popular browsers include Google Chrome, Mozilla Firefox, and Safari. Browsers work by sending requests to web servers, which then deliver the requested content. They also support various features like bookmarks, tabs, and extensions to enhance the user experience. Security measures, such as private browsing and pop-up blockers, help protect users while they explore the web.