PEO, EOR, RPO, BPO, ASO, HRO, Staffing and Payroll Outsourcing: What's the Difference?

PEO, EOR, RPO, BPO, ASO, HRO, Portage Salarial, umbrella companies, payroll outsourcing, staffing and employee outsourcing all get lumped together — here's what actually distinguishes each model, and how to tell which one fits your situation.