systemctl command which is mostly used to enable services to start at boot time.
systemctl enable service_name, and the service will automatically start at boot time.
What is the use of service start service_name
Both commands are used to up and down services in GNU/Linux.
But, service command is using by sysvinit, and systemctl is using by systemd.
In systemd, service command exists yet, but only to legacy compatibility with old sysvinit scripts