What is the difference between footnotes and endnotes?
Footnotes appear at the bottom of the relevant page. Endnotes appear in a list at the end of the text, just before the reference list or bibliography. Don’t mix footnotes and endnotes in the same document: choose one or the other and use them consistently.
In Chicago notes and bibliography style, you can use either footnotes or endnotes, and citations follow the same format in either case.