Okay kiddo, so imagine you want to play with your friends, but your friends live all over the place and it's hard to know who is available to come over and play. That's kind of like how companies feel when they need workers for a job, but they don't know who is available or looking for work.
So, what they do is they go to a place called a "hiring hall." This is a special place where workers who are looking for jobs go to sign up and let the hiring hall know they are available.
The hiring hall keeps track of all the workers who have signed up and what kind of work they can do. When a company needs workers, they call the hiring hall and say what kind of workers they need. The hiring hall then looks at their list of workers and finds the best match for the job.
Then, the hiring hall lets the worker know that they have a job for them and gives them all the information they need to get to the job site. The worker goes to the job site and does their best work.
Once they are done with the job, they go back to the hiring hall and let them know that they have finished. The hiring hall then pays the worker for the work they did and updates their records to show that the worker has successfully completed a job.
So, in summary, a hiring hall is like a special place where workers who are looking for jobs can sign up and companies can go to find workers. It's kind of like a matchmaker for jobs and workers!