It's a 2.5" drive, so it'll fit neatly into your console (doubling the storage of your PS4 Pro, and potentially quadrupling the size of a regular 500GB model), and Seagate is a big, well ...
It also received a mid-life refresh with the release of the PS5 Pro ... whereas the PS4 has a 500GB HDD. Aside from the difference in storage space, having a console powered by an SSD instead ...