It could be the Footnote/End Note or the Bibliography. Likley the first one (Footnote) though.
I would say it's a comment.
footnote
end note
Footnote
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A graphical document helps people see what you are trying to explain. When you use a graphical document, you are incorporating pictures with words.
In computer using software like ms word we can format a document. After formatting ,the document will appear different . Thus formatting changes the appearance of a document.When users FORMAT a document they can change its appearance.
A document is a form of information . A document can be put into an electronic form and stored in a computer as one or more file s. Often a single document becomes a single file. An entire document or individual parts may be treated as individual data items. As files or data, a document may be part of a database . Electronic Document Management (EDM ) deals with the management of electronically-stored documents. When using certain computer application programs such as a word processor , a document is the unit of saved work. Each document is saved as a uniquely named file.
On the computer this is called hiding windows. They will end up in the side bar for easy access.
end note
The explanatory note that is located at the end of a book or document is called the endnote. It comments or sites references that are used within the document.
footnote
In MLA style, the superscript number is used as a note reference mark to signal the existence of an explanatory note. The superscript number corresponds to the note located at the bottom of the page or end of the document.
Usually nothing, footnotes are to end the page and are notes that are explanatory to the text. After footnotes in your document, you can have footer, if you wish.
End notes go at the end of a document or section of a document. Foot notes go at the foot of the current page.
note reference marks
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A footnote.
explanatory notes
A note reference mark signals that an explanatory note exists at the bottom of the page as a footnote. Each mark corresponds to a specific note providing additional information or citations related to the text.
it is a header