An adjective clause, or relative clause, is a form of a structured clause that works to explain a noun in a sentence. It features as an adjective even though it is made up of a set of phrases instead of just one word. inside the case of an adjective clause, all the words paintings collectively to modify the noun or pronoun.
The piano, which had been tuned recently, sounded wonderful in nonessential clauses.
Which had been tuned recently is an adjective clause.
The piano, which had been tuned recently, sounded wonderful in essential clauses.
A nonessential clause is essentially an aside or provider of superfluous information about a preceding word that might be interesting but is insignificant to the sentence's main point.
Essential clauses modify keywords and are important to the main point of a sentence. Nonessential clauses provide superfluous information that, while interesting, does not change the main point of a sentence.
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