What was the first web browser, created at CERN in 1990?

The first web browser, created at CERN in 1990, was WorldWideWeb.

Tim Berners-Lee developed it on a NeXT computer while working at CERN. It was more than a browser: it also functioned as a WYSIWYG HTML editor, letting its creator read documents and create or modify links in the same application. The first working version was completed by the end of 1990, and the project became available more broadly in 1991.

WorldWideWeb could handle early Web resources through protocols including HTTP, while also working with local files, FTP, and newsgroups. Its name originally referred to the software, not only to the growing network of linked documents.

It is easy to confuse it with Mosaic, Netscape Navigator, or Lynx. Those browsers were important later, especially Mosaic’s role in popularizing graphical Web access, but they were not the first. WorldWideWeb was eventually renamed Nexus to prevent confusion between the program and the World Wide Web itself.