A zombie process is a process that has completed execution but still has an entry in the process table.This can happen when the parent process exits before the child process, or when the child process crashes.Zombie processes can accumulate over time and consume system resources, so it is important to avoid them.
There are a few ways to avoid zombie processes.One is to use the `wait()` system call to wait for a child process to exit before the parent process exits.Another is to use the `SIGCHLD` signal to catch when a child process exits and then call `wait()` to reap the child process.Finally, it is also possible to use a process manager such as `systemd` or `supervisord` to manage child processes and automatically reap zombie processes.
