"Payroll" means:

1. the process of paying employees at a business
2. a list of the employees at a company
3. the money that the business has to spend on its employees:

For example:

I leave all of the payroll stuff up to our Financial officer.

We have over 3,000 employees on our payroll.

All employers are required to contribute 2 percent of their total payroll to unemployment insurance.

This word comes up in some phrases like:

payroll taxes

cut (a company's) payroll

payroll records

a payroll check