[cbarrick]

It would also explain it for non-emacs users.

I am not and never have been an emacs user, yet I still know of org-mode.

[zahlman]

I've heard of it many times, but have basically no conception of what it actually is.

[codethief]

It's a file format / markup language (think Markdown but more feature-rich) with excellent editor support in Emacs.

[coldtea]

That's like describing a swiss army knife as a "beer opener"