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When a child process exits and if parent process is not waiting to receive exit status of it, the child process is termed as Zombie process. This process continues to exist in process table, its PID is not freed even though it has terminated.
- R@M3$H.N October 03, 2014If parent process exits before child process, the child process is called as orphan process. This process is put directly under the INIT process and its parent process ID becomes 1. There is slight difference between zombie and orphan that is zombie process's parent may not have exited while orphan process's parent has terminated.