You can have specific stats for selected directories on your webserver. The daily graph will show you traffic for those directories and you can get stats for each of them (traffic, requests, accesses). This is very useful to compare which part of your server have the biggest activity.

Best is to enter the first subdirectories level. If you have a well structured server with specific directories for each topic, you can then know the relative percentage of accesses for those topics.
If you have a tree for different language (ie /uk/, /sp/, /fr/), you'll be able to see which language people are using the most.