I just uploaded a new video. It is the first in a playlist on the concept variously known as "Variation", "Variability", "Dispersion", "Spread", and "Scatter". It gives an overview of the concept and compares and contrasts several measures of Variation:
Future additions to the playlist will cover in more detail:
Andrew A. (Andy) Jawlik is the author of the book, Statistics from A to Z -- Confusing Concepts Clarified, published by Wiley.