A parenthesis
refers to some words or phrases in a sentence that are not essential for correct grammer, but that give additional information. This is shown by the use of commas, brackets, or even dashes.
"She walked through the door, which had a Yale lock, and closed it behind her." (commas have been used as a parenthesis).
"He ate bananas - which he loved- with his toast. "(dashes have been used).
"Here is the answer (although not complete) that you wanted." (brackets have been used).
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