A restricted clause alters the noun that comes before it in a significant way. In contrast, a nonrestrictive clause describes a noun in a nonessential way.
What are the characteristics of their respective head?
A restricted clause introduces information that is required for the sentence's meaning to be understood. The meaning of a nonrestrictive clause can be changed by removing it.
Nonrestrictive clauses are normally separated from the independent sentence with commas; restrictive clauses do not require punctuation.
Restrictive:
Essential to the sentence,
Needed to maintain meaning,
Not set apart by punctuation
Nonrestrictive:
Set apart by punctuation
Not essential to the sentence
Add detail but not needed
To learn more about clauses, refer below
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