What’s the difference between style guides, pattern libraries, and design systems?

In my organization, we’re trying to implement an integrated marketing plan which will be helped along greatly by a sound design system. In order to implement this properly, a shared vocabulary needed to be created so we could be sure we were referring to the same thing.

http://josephfitzsimmons.com/whats-the-difference-between-style-guides-pattern-libraries-and-design-systems/