Mosaic (web browser)

Mosaic was the first widely popular graphical web browser, developed at the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign and released in 1993. Its decision to render images inline — rather than as separate downloads — transformed the World Wide Web from a text-based scientific tool into a mass visual medium, catalyzing the dot-com boom and the platform economy that followed. Mosaic was not merely a technical innovation; it was a redefinition of what the internet was for.

The commercial browsers that followed — Netscape Navigator and Internet Explorer — were direct descendants of Mosaic's codebase. The browser's lead developer, Marc Andreessen, left UIUC to co-found Netscape Communications Corporation, taking the institutional knowledge of the Midwest and turning it into the infrastructure of Silicon Valley.

Mosaic did not just make the web accessible. It made the web visual, and in doing so it changed what kind of information could thrive on the internet. Text-based knowledge — scientific papers, technical documentation, reasoned argument — gave way to image-based engagement: advertising, spectacle, and the attention economy. The inline image was a small technical decision with catastrophic cultural consequences.