Netscape Communications was a computer services company best known for its Web browser, Navigator. In 1993, a team led by Marc Andreesen created Mosaic at the University of Illinois' National Center for Supercomputing Applications (NCSA). Mosaic was the first Web browser that had a graphical user interface (GUI). The browser was subsequently renamed "Navigator".
Navigator was one of the two most popular Web browsers in the 1990s; however, by 2002, its usage had almost disappeared. This was primarily due to the increased usage of Microsoft's Internet Explorer web browser software, and partly because the Netscape Corporation (later purchased by AOL) did not sustain Netscape Navigator's technical innovation after the late 1990s.