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A daemon is a computer program that runs in the background, performing tasks without direct user interaction and often providing services for other programs or system functions. These programs are essential in Unix-like operating systems (such as Linux) and Windows, where they are often called "services". Daemons handle crucial tasks like managing system resources, running scheduled jobs, providing network services, and overseeing hardware devices.

Key Characteristics

Background Operation: Daemons operate without a user interface and don't require user input to function.

System Startup: They are often initiated when the operating system boots up and run continuously until the system shuts down.

Service Provision: Daemons provide essential services, such as handling web requests (httpd), managing network connections (sshd), and executing scheduled tasks (crond).

Independence: They are typically parented by the system's initial process (like systemd or init) rather than an interactive user process, ensuring they continue to run even if the user session ends.