A domain name is composed by a name (mark, company, family name, etc) and an extension. The latter can be a geographical suffix of two letters (.fr, .de for example) or a generic suffix in three letters (.com, .net for example).
Any machine on the Internet is identified by a succession of figures (addresses IP) not easily memorable. To simplify this identification, it was decided to make correspond at each address IP a different name: domain name.
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