Article missed to ignore gigantic blocks of technologies used. This is not a good place to figure out what the person is current in. Side question: I keep hear

Article missed to ignore gigantic blocks of technologies used. This is not a good place to figure out what the person is current in. Side question: I keep hearing that ATS have filtering systems to block and auto reject candidates' resumes if they don't hit targeted keywords. Would like to know some of these companies / what the ATS actually is. I have worked with several ATS systems with several companies and each one always have to a human going through every single resume.