Okay kiddo, so a long time ago, a man called William Beveridge looked at how many people in a country had jobs and how many people didn't.
He found out that sometimes when there were a lots of jobs available, there were still some people who didn't have a job, but when there weren't many jobs, there were even more people who were jobless.
Then he drew a graph called the Beveridge Curve, where on one side he put the number of jobless people, and on the other side the number of jobs available.
The curve shows that when there are lots of jobs, there are fewer people without jobs, but when there are fewer jobs, there are more people without jobs.
This is a helpful way to show what's happening in the job market of a country, so people can try to make sure that there are enough jobs for everyone who wants one.