The document discusses intranets, their technology and uses. An intranet is a private internal network that uses internet technology for communication and information sharing within an organization. It allows improved internal communication and access to information. The technology behind intranets includes TCP/IP networks, firewall protected internet connectivity, web servers, databases and authoring tools. Intranets are advantageous as they are platform independent, easy to publish and maintain information on, and cost effective. Some disadvantages include potential security concerns and information overload. The document also discusses DNS, defining it as the distributed naming system that maps names to internet addresses and stores retrieval information in a global data store.