What is this thing on spotify where you can see what spotify thinks you've been listening to the most?

[Ash]

Every week on his YouNow, Dan (youtuber danisnotonfire) usually gives us an update on what spotify thinks he has been listening to the most each week, then he tells us whether it is accurate (and for him it's not very accurate and that is why it's a running thing each week on his YouNow, because it's kind of funny).

Is it an app? If yes what is it called? I want to try it.