A noun and its adjective(s) create a group together that is technically called a noun phrase. In its simplest form, a noun phrase consists only of a noun (that is, a bare noun without any adjectives).
It is important to know about noun phrases because some grammatical elements are added to the end of the group rather than to the noun. For example, the indefinite article (-i):
|ketâb-e khub-i||a good book|
|ketâb-e khub o âmuzande-i||a good and informative book|
|کتاب خوب و آموزندهای|
As you see, in English, the indefinite article is added to the beginning of a noun phrase whereas in Persian, it is added to the end.