This view displays various facts on your collection. For the moment, it features:
The genre repartition (it is reliable only if your collection is well tagged). It allows you knowing which genre you own the most.
The size repartition by devices. It allows you knowing what are your device sizes in comparison.
Your entire collection size per mouth (a same track can map several files). It is used to get a collection size evolution: can be useful to know if some cleanups are required for example.
Your entire collection number of tracks per month. It allows you knowing how many actual different tracks you have, independently of the number of redundant files you have in your collection.