Data tracking follows the theme of formatting rules with a difference, that is, its formatting results are determined by comparing two different results.

Data tracking is used to compare two different result sets returned by the query; a basic comparing scenario would be the current results set compared to the previous results set.

With data tracking, we can analyze changes over time and are able to track increments and decrements of changes along measures and dimension values.

A classical business question can be delivered by a weekly sales report checking whether there was a decrease or an increase in the current week's sales compared to the previous week.