OK, I’ve read the wiki entry but I still don’t understand what KVM is, or why it’s needed. The last time I visited a data center - every server rack came with a laptop-esque looking control unit. What problem does KVM comes to solve? What does this invention improve upon a traditional KVM?

“Show my ad to hornly lonely 13 y/o that suffer from Tourette”
vs
“Here is a list of 13 y/o that suffer from Tourette”

One of these options is less profitable for an ad network in the long run.