I found this in my help files. What does it mean? Why is it there?
Vi and Vim Stack Exchange is a question and answer site for people using the vi and Vim families of text editors. It only takes a minute to sign up.Sign up to join this community
That's a "modeline", a feature of Vim. If it encounters such a line in the first or last 2 lines of a file, Vim reads settings from it and applies them to the current buffer.
Example: Forcing a file with extension
.rdf to be handled as file type
<!-- vim: ft=xml --> <!-- rest of file -->