Third Party Payroll - Payroll

Dear Seniors,
Just want to understand what is the purpose to make salary from third party? Want to know why company appoint third part payroll to make salaries for own staff?
Apart from confidentially is there any other reason???
Regards,
Sandeep C.

Sandeep C - Outsourcing leads to efficiency. In this case, outsourcing payroll lowers the cost per transaction, ensures the cost on technology upgrades is lower (cloud computing and SaaS) and ensures someone else is driving a zero defect process without consuming too much of management bandwidth.