On Facebook, Download Your Information will also show you some of the inferences Facebook makes about you. For instance, it might show you that it's recommending football-related content because you shared an article about football with a friend. And on Instagram, you'll be able to see categories assigned to some accounts -- like sports or fashion -- that are used to suggest content in the Explore tab.
You probably won't do much with this data, but it could be interesting to see how Facebook and Instagram are keeping tabs on you and why they're recommending certain content. Last year, Facebook also increased transparency about ads, sharing details about why you were matched with specific advertising. While it may seem like this is a noble step for Facebook, it's driven, at least in part, by regulation like the General Data Protection Regulation in Europe and the California Consumer Privacy Act. As we've said before, Facebook only cares about privacy because it has to.