What is Desktop environment ?

[a dehqan]

In The Name Of God The compassionate merciful

Good day everyone ;
What is Desktop environment ? would you explain just your self in
*minimum*1/2 line ? This Desktop Environment explanation will be
copied into a
typographic non-free ubuntu book so sites and ebooks can not be used for
this aim (generaly). so just your self tell if you give permission your
answer be copied in book .

Regards dehqan
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