A domain is a unique site address, much like a personalized license plate for your car. A domain consists of a name and a suffix known as an extension. A domain name combined with an extension appears as domain.com, or myname.com. Domain extensions can be public, such as .com, .net and .biz, or private like .gov (for government organizations). Countries also have designated extensions, such as .uk for the United Kingdom, or .de for Germany. Non-profit organizations generally carry a .org extension.