The domain name or simply the domain – a symbolic name, which is specifically used to identify areas – units of administrative autonomy on the Internet – in the higher hierarchy in such a region. Each of the areas and called a domain. The total space of functions thanks to the Internet DNS – Domain Name System. Domain names allow Internet site address and located on the network resources are primarily a web-site and e-mail server in a convenient human form. With the development of the Internet have purchased a special value “beautiful” web addresses, in other words domains. The total number of registered domains is approaching 200 million and pick up a free, beautiful and short domain name has become very difficult, but possible.

The fully qualified domain name consists of a direct domain name and then the names of all the domains in which it is separated by dots. For example, full name ru.wikipedia.org represents the third level domain ru, which is a second-level domain wikipedia, which is a top-level domain org, which is a nameless root domain. In everyday speech under the domain name often understood is an FQDN. (From the website Wikipedia) Formed market resale of domain names. This includes companies that register domains, buy and sell domains on the secondary market, are engaged in advertising on registered domains, hosting services, legal and legal organizations, etc. About 30% of sites do not contain any information and exist only for the sale of advertising links.