Advanced Normal Forms

I recently browsed upon some advanced high level reasoning.

4nf & 5nf.

4th Normal Form and 5th Normal Form.

It basically has to do with relationships between data elements at a higher degree than most typically relationships.

Here's the link I referenced to get a brief understanding:



I don't pretend to be an expert on this subject, however, I'm surprised I never had much interaction with it prior.

If you can make sense of it in simple terms, please post a comment or link