the.com/sysvinit
the first process, the one that starts everything else and waits patiently to reap them all.
means a linux init system that boots your machine through sequential runlevel scripts, born from unix system v.
from named after at&t unix system v (1983), where its runlevel model first appeared; it became the default boot process for most linux distros through the 1990s and 2000s before systemd came for its throne.
process idalways pid 1, the ancestor of everything
runlevelsnumbered 0 through 6, each a boot state
replaced bysystemd, in most major distros by 2015
still alivedevuan and slackware kept it running