###Process creation
- parent process: creating process
- child process: new process created
- each of these new process may in turn create other process, forming a tree fo process.
- Process Identifier (PID): an Interger number that provides a unique value for each process in the system. -PID can be used as an index to access various attributes of a process withing the kernel.
PPI - parent process identifier
Parent of all the process is called the init process with pid=1 | serves a the root parent process for all user process
two children of init- kthreadd and sshd
kthreadd -> parent of all the kernel process
sshd -> responsible for managing clients that directly log onto the system