Mosaic Browser was introduced on April 22, 1993.
The National Centre for Supercomputing Applications released version 1.0 (RTM) of the Mosaic Web Browser. It was the first browser with a Graphical user interface for content. Marc Andreesen and Jim Clark were the lead developers. The browser would take the internet by storm and continue to lead until 1998 when IE and Netscape came on the scene.
Featured image source: theregister.co.uk
