Temporary Agencies

Could someone tell me how they actually work? I search indeed and see a job I am qualified to perform so it is through an agency example Adecco, Appleone, Randstad etc I apply to the job and NOTHING. I look to see if the job has a specific recruiter's name and I email them and still nothing. They won't call or respond back to the email that was sent. I don't know what I'm doing wrong but some of these jobs put positions out there and they either need 1 person or they already know who they want.

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