The purpose of a nonrestrictive or parenthetical element in writing is to provide additional information or clarification about a person, thing, or idea without changing the essential meaning or structure of the sentence. It is often set off by punctuation such as commas, dashes, or parentheses. These elements are not essential to the main point of the sentence and can be removed without fundamentally altering the overall meaning. They enhance the richness and complexity of the sentence by adding extra details or comments.
