What is a reletive clause?

A relative clause is a dependent clause that provides additional information about a noun in a sentence, often introduced by relative pronouns such as "who," "whom," "whose," "which," or "that." It helps to specify or clarify the noun it modifies. For example, in the sentence "The book that you lent me was fascinating," the relative clause "that you lent me" gives more detail about "the book." Relative clauses can be essential for meaning or non-essential, depending on whether they are crucial for understanding the sentence.