What are "Learner Pathways" and how to use them?

The nutmeg release notes say " * Course Discovery API now supports Learner Pathways and Course Recommendations".

What are “Learner Pathways”? (There’s no further documentation on them for edx.readthedocs.io.) Is this a way to string together multiple courses? If so, that’s something I’m interested in setting up, so how can I do that?