Domain Name System (DNS) is a system that allows the name of a host on a computer network or the Internet translated into IP addresses. In giving the name, the DNS uses hierarchical architecture.
1. Root-level domains: an upper level which is shown as a dot (.).
2. Top level domains: organizational category code or country for example:. Com for use by the company;. Edu is used by the college; Gov for use by government agencies, In addition to distinguishing the use of the name by a country with other countries to use such marks. Id for Indonesia or. Au is for Australia.
3. Second level domain: is the name for the organization or company, for example: microsoft.com; yahoo.com, etc.