systemd-journald are the same notion.
journald is often used as a shorthand for
which is the logging component of the systemd system and service manager.
Systemd is a suite of software that provides fundamental building blocks for managing and controlling the Linux operating system.
It includes various components, including
systemd-journald, which is responsible for collecting, storing, and retrieving log data.
systemd-journald is the name of the daemon process that runs
journald. It is the specific instance of the
journald daemon that is launched and managed by
journald is the concept of the logging component, while
systemd-journald is the specific instance of the daemon responsible for executing the logging functionality.
systemd-journald refer to the same daemon, and they are used interchangeably to denote the logging functionality provided by systemd.
journald.conf, journald.conf.d, [email protected] — Journal service configuration files
Tutorial: Logging with journald