Who would use this? Faculty
What is it? A tool that allows you to easily build fun interactive elements for your course content and embed them into your course page.
When would one use this? When you want to give your students a chance to practice with the content they are learning.
Where can I find this stuff? Get started at H5P.org
Why should I use it? Course content (say on your D2L course page) could often use a little more interactivity. H5P is an easy to use tool where you can build all kinds of fun ways to allow students some practice with course concepts.
Have a look at this slide deck outlining H5P and how you can use it in your course materials.