How does networking work?

Like, I want to help a few people I know out. I introduced one of my friends to someone I know at a company he really wanted to work for, but the person I know never got back to him after getting his resume. I connected another of my friends to a recruiter I know looking for interns, and she didn’t get the job either. I thought networking was important, it never seems to work out. Can someone explain networking to me

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