The Web was invented in 1989 by Tim Berners-Lee and other physicists at the European Particle Physics Laboratory (CERN) in Geneva, Switzerland. They invented the Web because they wanted to use the Internet to share documents that contained both text AND pictures and images (multi-media).
The first Web browser -- the computer software that lets us use the Web -- was released in 1993 by the National Center for Supercomputing Applications (NCSA). It was called Mosaic®. This first Web Browser allowed computer users to use a mouse to move through the Web, and also allowed for graphics and other media to be used in Web documents.
There are dozens of Web browsers on the market today. Most of us use Netscape® or Internet Explorer®.