A mosaic may refer to any of the following:
1. Officially known as NCSA Mosaic, Mosaic was the first widely used graphical World Wide Web browser. It was developed and first released on April 22, 1993 by the NCSA with the help of Marc Andreessen and Eric Bina. The development and support of Mosaic was officially discontinued on January 7, 1997. The picture is an example of Mosaic 1.0. Image credit goes to NCSA/University of Illinois.
2. A mosaic is a description of smaller images, stones, glass, or other material that make up a bigger image. In the picture below is an example of a mosaic picture made up of smaller images using AndreaMosaic.