The internet has grown and changed over the years. It originally started as a U.S. government project that was called the ARPANET. This was essentially just a group of networks that were combined together using the TCP protocol. As it grew, changes needed to be made to the infrastructure. This is when the World Wide Web was developed at the European Organization for Nuclear Research (CERN). This is also when the first web browser was created. Eventually Hyper Text Transfer Protocol was developed and this is when things really started becoming user friendly. Browsers now had the capability to display images, music, and videos. Newer browses built off of that and lead to what we have today.
References: http://www.history.com/topics/inventions/invention-of-the-internet, Technology In Action, Introductory, pages 76-77
Photo Credit: https://commons.wikimedia.org/wiki/File:Applications-internet.svg