Systemd is a system and service manager for Linux operating systems. It is designed to start up and manage system processes, services, and resources efficiently. By using a unified approach, Systemd simplifies the management of system services and improves boot times. One of the key features of Systemd is its ability to handle dependencies between services, ensuring that they start in the correct order. It also provides tools for logging and monitoring, making it easier for administrators to manage system performance and troubleshoot issues.