A domain name is an unique name of the website. Domain names represents an IP adresses (Internet Protocol) resources. They are used in URLs (Uniform Resource Locators) to identify particular Web pages. An important function of domain names is to provide easily recognizable and memorizable names to numerically addressed Internet resources. Domain names are used to establish a unique identity. Organizations can choose a domain name that corresponds to their name, helping Internet users to reach them easily.

There can be different levels of domain names of the Internet. For example, the top-level domains (TLDs) are com, net and org. The country code top-level domains (ccTLD) were based on the two-character territory codes of ISO-3166 country abbreviations. In addition, a group of seven generic top-level domains (gTLD) was implemented to represent categories of names and multi-organizations. These domains are gov, edu, com, mil, org, net and int. After the top-level domains in the domain name hierarchy are the second-level domain (SLD) names. For an example, these are: co.uk, co.in, de.com. Next can be third-level domains and so on, with no limitation. Every domain name is unique. For example, in the URL https://www.synergyservers.com/index.php, the domain name is .com, and second-level domain name is synergyservers.com.