It corresponds to the buying of an album or a track. You then acquire the definitive rights on it, and the possession of the audio files. Unlike streaming, you do not have to possess a subscription to pay for downloads.
Once you have paid for an album, you can download it to listen to it on the device of your choice, but only for private use. You can also listen to it on our applications.
You can redownload an album that you already paid for at any time, as many time as you wish.