What is the difference between Content Strategy and Content Marketing? (and other adventures in communications)

A definition of content strategy is not hard to come up with. It is the process of having a "strategy" for your "content" - what we publish, where, why, and how we measure its success. For some reason, when you tell people you "do" content strategy, they say "Oh, you make viral videos" or "you write blog posts", or "ah, you're an editor". In a small company it's a both/and answer, in a large company it's a neither/nor one.