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A domain or domain name is a unique identifier of a computer and server on the Internet. It replaces the original IP address with a text designation chosen by the website operator.

Thanks to domains, you do not have to enter the IP address of the server, for example 87. 256.122.05, when visiting a website. You just type in the name of the website, e.g.

In practice, you will encounter three categories of domains. The first is called a top-level domain, or TLD. These are national domains, e.g. cz, com, sk. A second-level domain is typically the name or description of a website, e.g. rascasone. A third-order domain (subdomain) is then used to specify a part of a website, e.g., where blog is just a third-order domain.


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