A domain name is an identification label that defines a realm of administrative autonomy, authority, or control on the Internet, based on the Domain Name System (DNS), Individual Internet host computers use domain names as host identifiers, or hostnames. Hostnames are the leaf labels in the domain name system usually without further subordinate domain name space. Hostnames appear as a component in Uniform Resource Locators (URLs) for Internet resources such as web sites.
Domain names are a common practise used on the web for reach a particolar host, like a website, on a specific IP address composed by an amount of numbers. So using words and letters is more easy for a user reach a specific website hosted on a server.
An important purpose of domain names is to provide easily recognizable and memorizable names to numerically addressed Internet resources. The right-most label conveys the top-level domain aka called TLD like .com .net .org etc...
Below the top-level domains in the domain name hierarchy are the second-level domain (SLD) names. These are the names directly to the left of .com, .net, and the other top-level domains usually knew like the website name.
There are also other kind of TLD (geografical, generic etc..) and there are also third-level domain where there is a word before the second-level domain, like for this blog.
Blogspot.com il the second level domain with the genertic TLD .com while domainsnameandhosting.blogspot.com is the third-level domain.
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