To learn what Syncplay is read the description of package 'syncplay'.

This package installs the Syncplay server program. Install this package when you plan to set up your own Syncplay server that your friends and family connect to.

Note that the computer that runs the Syncplay server must be reachable from the Internet. To enable encryption, you need a domain and a valid certificate. The package provides a hook script for the recommended certbot package to simplify encrypted configurations. Integration with the suggested packages dehydrated or acme-tiny requires manual configuration.