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In the Linux world, system management and initialization are crucial for maintaining an efficient, stable, and secure operating environment. This is where systemd steps in — a system and service manager that has become the de facto init system for several Linux distributions. Systemd offers a suite of functionalities, including aggressively parallelizing service start-up, on-demand service starting, and better transactional dependency handling. In this article, I'll guide you through the basics of systemd, its core components, and how to install and manage systemd services across different Linux distributions using different package managers, specifically apt, dnf, and zypper.