A parenthetical element is a word or group of words that interrupts the flow of a sentence and adds additional (but nonessential) information to that sentence. This element can be long or short, and it can appear at the beginning, the middle, or the end of a clause or sentence.
Can u add the list of writers?
Both bc they all follow each other so it really depends on the person their with
You use it to make a pause in a sentence