You might want to let users be able to download multiple files at once. Traditionally you'd have to create a zip archive that contains the requested files.
The medialibrary is able to zip stream multiple files on the fly. So you don't need to create a zip archive on your server.
MediaStream class that allows you to respond with a stream. Files will be zipped on the fly and you can even include files from multiple filesystems.
Here's an example on how it can be used:
public function download(YourModel $yourModel)
$downloads = $yourModel->getMedia('downloads');