A payroll service bureau is like your allowance-giving grandma, but for businesses instead of kids.
Just like how your grandma takes care of giving you money every once in a while so you can buy your favorite snacks or toys, a payroll service bureau takes care of giving money to employees who work for a business.
When a business hires employees, they have to pay them for their work. But it can get pretty complicated and time-consuming for the business to calculate how much each employee should get paid, how much should be taken out for taxes, and other deductions.
That's where the payroll service bureau comes in. They help the business figure out all of that complicated stuff, and they even take care of actually giving the money to the employees.
So just like how your grandma takes care of all the hassle of giving you your allowance, the payroll service bureau takes care of all the hassle of paying employees for the business.