All Internet site names end with a period and an extension. The most popular extensions are .com, .net, .org, .edu, .gov. There are actually seven extensions available (can you name the others?) for web sites, but that doesn't seem to be enough.Just as big cities outgrow their area codes, the Internet is outgrowing its domain name extensions, and the International Cooperation for Assigned Names and Numbers is about to do something about that problem. All extension names must be approved by the ICANN, a California-based group.New extension names will be announced some time next year.