A domain name is the address of your website on the Internet, where anybody can find your site. Domain name is a part of website’s URL (Uniform Resource Locator). All domain names are unique.
-Domain Name System (DNS) was invented because it was very hard for Internet-users to remember IP-addresses, that consist of a set of numbers. Domain names are associated to specific IP-addresses and can be used instead of those IP-addresses. DNS convert domain name to equivalent numeric IP-address. List that links IP-addresses with domain names are stored on DNS servers. If database on DNS server not contain specific domain name, it send query to the next DNS server and so on, until the desired bundle “domain name/IP-address” not found.
Examples of domain names:google.commicrosoft.com
URLs for this domain names:http://www.google.com/http://www.microsoft.com/
URL always includes a domain name.
Domain name have hierarchical structure and it divided into levels. Each level is separated by point.
-For example: earth.google.comcom - top-level domain (TLD) or first-level domain,google.com - second-level domain,earth.google.com - third-level domain.
-The number of top-level domains are limited. There are generic top-level domains - gTLD (.com, .org, .edu, .net and others) and country code top-level domains - ccTLD (.us, .fr, .de, .ru and others).
You can register top-level domain name with one of the registrars for term of 1 year or more.
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