Charts are a useful tool when you need to communicate a lot of data quickly and effectively. Sometimes a chart isn't very useful if the data is not broken out in a meaningful way. Dynamics CRM allows you to drill down into the data so you can extract something meaningful. Let's look at an example.
First, Navigate to Sales-Accounts, and expand the Charts area on the right edge by clicking on Charts:
If you haven't made customizatons to charts yet, you'll see the 4 standard System Charts when you click on the down arrow:
I've selected the New Accounts by Month:
As you can see, it's not that useful. All 10 of my accounts were created in July. But, I can 'drill down' by clicking on the blue bar to get some more details about these accounts:
Click on the chart and box appears prompting the user to select a field. I would like to see a breakdown by state so I select 'Address 1: State/Province' from the list:
Next, click the blue arrow which means "OK"
...Voila! My Drilldown chart is displayed, and it is much more interesting than the original chart.