<operating system> The Unix process
that created one or more other processes.
Every process except process 0 is created when another process executes the fork system call
The process that invoked fork is the parent process, and the newly created process is the child process
Every process has one parent process, but can have many child processes.
identifies each process by its process identifier
Process 0 is a special process that is created when the system boots; after forking a child process (process 1), process 0 becomes the swapper process.
Process 1, known as init, is the ancestor of every other process in the system and enjoys a special relationship with them.