An appendix contains data that cannot be placed in the main document and has references in the original copy or file. An annex, on the other hand, is usually a standalone document that offers additional information than contained in the main document.
Can an annex have an appendix?
An appendix is a kind of annex. In other words, every appendix is an annex, but not every annex is an appendix.
What is difference between appendix and Annexure?
an Appendix is “a supplementary document attached to the end of a writing. an Annexure is “something that is attached, such as a document to a report”.