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we know that the fork system call is used to create a child process so apparent process will call this Fork system call and this will create a child process which will be the duplicate of the parent process so a copy of the parents address space will be created for the child whatever was the parents address space a similar address space will be created for the child process so whatever Pages were belonging to the parent similar pages will be created in the child process also now we know that once a child process has been created as soon as it is created it will usually invoke the exact system call so that it can load a new program in this address space so the copying of the parents address space now becomes unnecessary or not required so initially the parents Pages were copied to create the child now if the child is loading another program by using this exec system call then why should the parents Pages be copied over here so this becomes unnecessary so we use a technique which is call