NTP stands for Network Time Protocol and is used for clock synchronization across multiple computers. An NTP server is responsible for keeping a set of computers in sync with each other. On a local network, the server should be able to keep all client systems to within a single millisecond of each other.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-configure-ntp-server-and-client-on-almalinux