A domain is a unique name given to identify the name of the server computer as a web server or mail server in a computer network or the internet. The function of the Domain is the internet users in untukmempermudah at the time of access to the server, as well as used to remember the name of the server that you visit without having to know complicated row numbers known as IP address. This domain name is also known as a unity from a website such as for example "URwikipedia.org". Domain names are sometimes referred to with the term URL, or Web address.
Example: for example the IP address of our web file server is stored is 184.108.40.206 fact we can just type 220.127.116.11 directly in the browser to access our website, but this is certainly not very good for the memory of people especially memories website visitors who access our website. So the domain function more to make people remember a url name than a row of row numbers IP. For that domain is required in order to replace the row numbers to be a row of words which is certainly easy to remember. for example: URnamadomain.com will be easier to remember than numbers 218.719.51.617
A domain name usually consists of two or more parts (technically called labels), separated by dots.
The right-most label States the top-level domain-high/top level domain (e.g., the address www.wikipedia.org has a top-level domain org).
Each label in the left specifies a subdivision or subdomain of the domain. Note: the "subdomains" stating the relative dependence, not absolute. Example: wikipedia. org domain is a subdomain of orgmerupakan, and id.wikipedia.org can form a subdomain of the domain wikipedia.org (the real id.wikipedia.org in practice, represents a host name-see below). In theory, the Division of this kind can reach a depth of 127 levels deep, and each label can form up to 63 characters, as long as the total length of a domain name does not exceed 255 characters. But in practice, some domain name registrants (domain name registry) has fewer limits.
Lastly, the far left of the part of the domain name (usually) stating the name of the host. The rest of the domain name stating how to construct a logical path to the needed information; the host name is the name of the true purpose of the system to search its IP address. Example: the domain name www.wikipedia.org has host name "www".