When the meaning of the word it explains depends on the relative clause's input, the noun would be difficult to understand without it.
When a relative clause's input is required for the noun it defines to make sense, the noun is said to be relative. Since restrictive clauses are required, no punctuation is used to separate them from the noun they are modifying.
Example: The cat was struck by a red and yellow automobile.
The meaning of a word or noun phrase can be constrained or defined by a restrictive clause, which also gives the sentence's noun the appropriate context. No commas are used to divide it from the rest of the sentence. Writing typically contains more restricted clauses than nonrestrictive ones. Another name for a limiting clause is an essential clause or phrase.
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