The Internet is comprised of Internet hosts, computers that function as the beginning and end points of data transfers. Each Internet host has a unique Internet address, which is expressed in a numerical form that is understood by computers and in a alphabetical form that is understood by humans.
Domain names have two parts.
The first part names the host. The second part, the top level domain, identifies the type of host. Lake-Sumter Community College's domain name is lscc.cc.fl.us . More information about the Domain Name System is available from the DNS Resources Directory . Until the early 1980s, the Internet had a manageable network structure, hosting a small number of users.