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Daemon Process:
In multitasking computer operating systems, the daemon process (also known as a background process that runs in the background with other processes) is a Linux or UNIX program that runs in the background. The Daemon process is known as one type of program that runs quietly in the background of the system rather than under the direct control of a user.

Orphan Process:
It’s a computer process whose parent process has already finished execution or terminated, though it remains running itself in the currently running process list. Orphan processes do not become zombie processes; instead, the orphan processes are adopted by init (process ID 1), which waits on its children.

Zombie Process:
A zombie process is known as a computer process whose execution is already completed but then also it has an entry in the process table list. Because of child processes the Zombie processes usually occur, as the parent process still needs to read its child’s process exit status. On UNIX / LINUX computer operating systems, a zombie process or defunct process is a process that has completed execution (via the exit system call) but then also has an entry in the process table: A zombie is a process in the “Terminated state”.

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