Administaff is a large publicly traded company that provides HR outsourcing services to approximately 6,000 small and medium-sized client companies across the United States. It handles various HR functions for its clients such as payroll administration, benefits management, government compliance, training and development, and recruiting. The document discusses how Administaff's services can help client companies focus on their core business by eliminating regular business interruptions associated with HR tasks and reducing costs and legal risks associated with employment issues.