TECHNOLOGY
Mosaic Browser
The 1993 graphical web browser Andreessen co-developed as a student at NCSA — the software that opened the internet to non-specialists and demonstrated the imagination-to-artifact pattern that would define his career.
NCSA Mosaic, released in 1993, was the first widely distributed graphical web browser. Developed at the National Center for Supercomputing Applications at the University of Illinois Urbana-Champaign by a team led by Marc Andreessen and Eric Bina, it combined image display with hypertext navigation in a form accessible to users without specialized technical training. Within a year of its release, Mosaic had become the dominant interface through which non-specialists encountered the World Wide Web. Its core contributors left NCSA in 1994 to found Netscape, which commercialized the technology and became the defining company of the early web. Mosaic is the technical artifact from which Andreessen's career as builder, founder, and investor proceeded.
In The You On AI Field Guide
Before Mosaic, the World Wide Web existed primarily as a technical substrate used by researchers, physicists, and a small population of enthusiasts. Earlier browsers — Tim Berners-Lee's original WorldWideWeb, ViolaWWW, Cello — had demonstrated the web's technical possibilities but remained specialized tools. Mosaic's contribution was