A domain is the unique name of a website on the Internet, consisting of different levels such as the root domain, top-level domain (TLD), second-level domain (SLD) and third-level domain (subdomain). The hierarchy, known as the Fully Qualified Domain Name (FQDN), is similar to a library identification number.
Domains are as individual as fingerprints and are used to make the IP address of a website easier to remember. They are not the same as the URL, but a component of it. The translation of domains into IP addresses is carried out by specialized web servers such as name servers or DNS servers. These are crucial for the resolution of domains. Without name servers, it would be impossible to connect to a website. A domain consists of several parts, including top level domain (TLD), second level domain (SLD) and third level domain / subdomain. The TLD is the top level of the hierarchy and the most popular worldwide is .com. The SLD is the name of the website, and the subdomain (usually www) refers to the homepage. Subdomains are suitable for structuring websites, e.g. for different language versions.
A domain not only helps visitors to find a website, but also lends the website professionalism and boosts user confidence. The name server is crucial for the accessibility of websites on the internet by returning the IP address of the requested domain. Overall, the domain is an essential part of the Domain Name System (DNS), which forms the basis for the functioning of the internet.