The grammatical name of this clause is;
- Relative or Adjectival clauses
Relative or adjectival clauses are groups of words that serve the purpose of modifying a noun, a pronoun, or a noun phrase.
They usually come after the subject that they modify. They also start with relative pronouns like who, whom, which, etc.
They also provide further information about the noun phrase, noun, or pronoun they describe.
This sentence above indicates further description or information about something that was mentioned earlier.
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