What is HR's function? If they use technology to screen resumes, What do they do next? How do they know who is a qualified candidate

What is HR's function? If they use technology to screen resumes, What do they do next? How do they know who is a qualified candidate? It seems all the articles I read on HR issues is that they want to be more involved in the "strategy" part of their organization then what they were hired to do. Where's the "human" part? If you can't identify the human solutions for companies, then we need to re-think what human capital is all about.