A Spotify Pre-Save allows a fan to save your album to their Spotify Library before it's street date. This allows the album to show up automatically in their Spotify Library on the day the album comes out which has the potential to increase the chances that the fan will listen and stream your album.
In order for your album to be available for Pre-Save in Spotify, you must utilize your album's magnet link which you can find on your album's page in your dashboard at Catapult. You can share this link with your fans by copying and pasting the link to your social media or email blasts.
You can learn more about Magnet links here.