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This template is intended to be useful for creating links to "diffs"; that is, links to pages that show the differences between two versions of a wiki page.
Every version of a page has a revision ID, which you can find from the history of the page by looking at the link for the timestamp, which is of the form:
http[s]://en.wikipedia.org/w/index.php?title=SomePageName&oldid=442212827
The number after oldid= is the revision ID.
This template does not require the page name, and provides a diff between a specified revision ID and the one immediately before it (i.e. what changed at a certain ID).