The basic difference between footnotes and endnotes is where they are placed in a document.
There is one basic difference between a footnote and an endnote: where it is placed. A footnote is at the bottom of a page and an endnote is at the end of a document (or possibly at the end of a section, which we'll discuss in the next lesson). That's it.
Regardless of the type of source you are referencing—a book, a periodical, an online source, whatever—you can use either a footnote or an endnote. The same is true for adding a comment or explanatory note.
The reason either will do is that they look much the same. Both footnotes and endnotes contain a note reference mark in the body text to indicate that additional information is in a footnote or endnote, but with a different numbering system used for each to tell readers whether to look for the note at the end of the page or the end of the document.
Footnotes and endnotes are both separated from the body text by a short horizontal line. And both have note text, either at the bottom of the page or the end of the document; the note text in both is in a smaller font size than is the body text.