Annex A refers to an additional section or attachment that provides supplementary information or details to a main document or agreement.
Appendix: An appendix is a section at the end of a book that includes supplementary material such as charts, graphs, or detailed explanations.
Addendum: An addendum is an addition or update made to a document after it has been finalized.
Exhibit: An exhibit is a separate document or item that is attached to another document, often used as evidence or supporting material.