When you write and store your content modularly, you can reuse it in all sorts of interesting ways. You might hear this referred to as “create once, publish everywhere” (shortened to “COPE”) or “single-source publishing.” Those are both pretty dry and technical.
I prefer to think of it as Content Everywhere.
You write, edit, and approve a single source of content. Since the content is modular, you can create different combinations of modules.
And thanks to the Internet’s magic robots (more formally known as Application Programming Interfaces, or APIs), you can push different content combinations to different platforms. You might send a photo and some tags to Instagram, combine those with a factoid and send them to Twitter, or send the photo and a short summary or pull quote to Facebook. Package a longer set of paragraphs with some images and charts and send those to your blog and to Medium.
Modular content gets pushed from your CMS (left) to a variety of platforms
Don't tell anyone I said so, but you can even assemble your modular content into PDFs. (No one will read 'em, though.)
In both those cases, live updates are exactly what you want. If you find a typo in a chart or change the data threshold for a particular passage of text, then it should update your content everywhere it's embedded. That's the entire dream of create once, publish everywhere.