BCA - UNIX and Shell Programming

Process id "1" identifies the init process, which is the final stage in the boot operation.
Init is in charge of launching system programmes according to the settings in the /etc/inittab file.
Init will usually launch several instances of "getty," which will wait for console logins to generate one's user shell process.
Init is responsible for controlling the shutdown sequence and processes.
The init procedure is never terminated.
Although it runs as root, it is a user process rather than a kernel system process.