Explain what a daemon process is in an operating system and how it differs from regular processes.

A daemon process is a background process in an operating system that runs without direct user interaction. Its main task is to perform system or service functions, such as handling requests, monitoring, and resource management.

Differences between a daemon and a regular process:

• Startup and management: Daemons are usually started at system boot and run continuously, whereas regular processes are started by the user and terminate after completing their task.

• Lack of interface: Daemons do not have a user interface and do not interact directly with the user.

• Background operation: Daemons operate in the background, not occupying a terminal or console.

• Detachment from terminal: When started, a daemon typically detaches from the controlling terminal (for example, via daemon() call or double fork) to not depend on the user's session.

Example: The Apache web server runs as a daemon, constantly listening for incoming HTTP requests and processing them without user involvement.

# Starting the Apache daemon in Linux
sudo systemctl start apache2