What is sectioned content and how can I add it to my webpage?

Sectioned Content is the ability to have a video or image featured on your webpage with the ability to accompany it with some text, i.e. a Heading as well as a description.

Here's an example of what Sectioned Content can look like:

If you want to add sectioned content to your webpage you just have to hit the Plus icon and select "Sectioned Content".