A running total tells you how much has piled up, while a rate of change shows...

https://elliottsinterestingjournal.lumenforgex.com/posts/what-does-integrable-rate-mean-in-simple-terms

A running total tells you how much has piled up, while a rate of change shows how fast it’s growing. With parcel counts or rainfall, the article explains why units matter and how a daily rate differs from a weekly total over the same span.