Okay, so a long time ago, there was a special land called Israel, and there were some kings who ruled over it. But, the people who lived there weren't always very nice to each other, so the land split into two parts - Israel and Judah.
Basically, the kings of Israel and Judah were people who were chosen to lead and take care of their lands. They were like the boss of the whole place, and they made important decisions about things like how to protect their people, how to make sure they had enough food and water, and how to make their land a good place to live in.
There were a lot of different kings throughout history, and some were really good at their jobs, while others weren't as good. Some kings were brave and fought in battles to protect their people, while others were wise and made good decisions to make their lands peaceful and prosperous.
But, sometimes, kings could also be selfish and greedy, and they would do things that hurt their people. When that happened, the people would get angry and might even try to overthrow the king and choose a new one to lead them.
So, that's basically it - the kings of Israel and Judah were the leaders who were in charge of keeping their lands safe and happy, but they had to be good and fair to their people or else they would not be respected or loved.