An internet browser is a software program used to access and view web pages. Some key browsers discussed include Internet Explorer, one of the first graphical browsers which was dominant in the 1990s; Mosaic, the first browser to display images inline; Google Chrome, released in 2008 and now one of the most popular; and Firefox, an open source browser first released in 2004 that is customizable and focuses on privacy and security. Browsers allow users to navigate websites, view images and videos, and perform other online activities through features like tabs, bookmarks, and integrated search tools.