Okay kiddo, let me explain what agency worker law is in a way that's easy for you to understand.
Have you ever had someone take care of you while your parents aren't there, like a babysitter or nanny? Well, sometimes companies also need someone to do work for them when their regular employees can't do it, like when they're sick or on vacation.
When this happens, the company can hire someone from an agency to do the work for them. This person is called an agency worker.
Now, the law says that agency workers should be treated fairly and equally to employees who do the same job at the company. This means they should get the same pay, holidays, and working conditions.
However, sometimes companies try to treat agency workers differently and give them less. This is not fair and the law protects agency workers from being treated unfairly.
So, agency worker law is just a set of rules that make sure that agency workers are treated fairly and have the same rights as regular employees.