An "Addendum" is a document that is added to the end of a primary document to provide additional information, clarification, or updates. It is commonly used in legal contracts, academic papers, and reports to ensure that all relevant details are included without altering the original text. Addendums can address changes in circumstances, corrections, or supplementary data that enhance the understanding of the main document. For example, in a real estate contract, an addendum might outline new terms agreed upon by the parties involved, ensuring that all aspects of the agreement are clearly documented.