Marginal Marking is a type of editing used in proofreading. It involves making small changes to a document, such as correcting spelling or grammar mistakes, without changing the overall meaning of the text. NOTATION is a form of marginal marking which involves adding notes or symbols to the text to indicate corrections or changes that need to be made. STET is another form of marginal marking which is used to indicate that no changes should be made to a particular part of the text. DELE is the final form of marginal marking which is used to indicate that a particular part of the text should be deleted.