Nonrestrictive clauses is should be set off with commas because they does not change the meaning of the sentence; they just add informations. Restrictive clauses is not (should not be) set off with commas, because they are essential to the meaning of the sentence.
What are Non-restrictive clauses?
The clause provides additional, non-essential information. The non restrictive clause are the clause that provides additional, non essential information. In other words, the non restrictive clause are not needed to identify the word it modifies.
As you could see, non restrictive clauses is separated from the rest of the sentence by 1 or 2 commas; restrictive clauses is not separated from the rest of the sentence by commas. There is a few other interesting usage points when considering whether a clause is restrictive or non restrictive.
Learn more about Nonrestrictive clauses here https://brainly.com/question/24452052
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