Snaps are cross-distribution, dependency-free, and easy to install applications packaged with all their dependencies to run on all major Linux distributions.| A Beginners Guide to Snaps in Linux – Part 1
Systemd is a service manager for Linux; a drop-in replacement for the init process, and the systemctl command is the primary tool to manage systemd.| How to Find Running Services in Linux with Systemd Commands [Quick Guide]
Systemctl is a systemd utility which is responsible for Controlling the systemd system and service manager. Systemd is a collection of system management daemons, utilities and libraries which serves as a replacement of System V init daemon. - Part 2| How to Manage ‘Systemd’ Services and Units Using ‘Systemctl’ in Linux