By “digital sales” I mean downloadable files (mostly AAC or MP3, via iTunes or Amazon for example), as well as streaming. CDs, USB sticks and some other media use digital data too of course, but we’ll classify those under “physical media” in order to make things easier to understand.
A lot of people still buy their music in digital online format nowadays, which allows them to simply download the music, in most cases via a service such as Apple iTunes or Amazon Music for example.
THE BIGGEST ADVANTAGE OF DIGITAL DOWNLOADS IS THAT THE ALBUM YOU BUY WILL BECOME IMMEDIATELY AVAILABLE.