A domain name gives you a unique descriptive address on the Internet which can be used to create email addresses, Web addresses or any other Internet address. This can identify your business, company name or organisation on the World Wide Web. There are a variety of domain name formats available, each appropriate for different organisations. These addresses are known as domain names. A domain name identifies a specific administrative group or organisation on the Internet and, just as each IP number must be unique, each domain name must also be unique.
Domain names comprise sets of labels, each of which tells something about the site.
The labels become more specific from right to left and each label is separated by a full stop. When you delegate your domain name to a particular Primary server, you can specify what machines are in that domain. If the DNS Primary is not available, a Secondary Name Server will be used.