What is purpose of /init

Hi, I just saw contents of /init on my system. #!/bin/sh # devtmpfs does not get automounted for initramfs /bin/mount -t devtmpfs devtmpfs /dev exec 0</dev/console exec 1>/dev/console exec 2>/dev/console exec /sbin/init $* Can someone explain what is meant for ? Regards, Rahul B.