Picture a big game of musical chairs, but instead of chairs, it's a throne. The throne represents the job of being the ruler of a country, like a king or queen. If someone wants to be the ruler, they sit on the throne, and everyone else has to stand around the throne and watch.
Now, let's say the current ruler decides they don't want to be the ruler anymore. Maybe they're getting older and want to retire or they've decided they don't like the job anymore. In that case, they need to find someone else to sit on the throne and be the new ruler.
That's where royal succession comes in. Royal succession is the process of choosing who gets to be the new ruler when the old ruler steps down or dies. Usually, the new ruler is the old ruler's son or daughter. If the old ruler doesn't have any kids, then the process gets a little more complicated.
That's where the royal succession bills and acts come in. These are special laws that say who gets to be the new ruler if the old ruler doesn't have any kids. For example, one royal succession bill might say that the new ruler has to be the old ruler's brother or sister. Another royal succession act might say that the new ruler has to be chosen by a group of important people in the country, like the parliament or the nobles.
In the past, these laws were really important because they helped prevent fighting and wars over who got to be the new ruler. Imagine if two people both thought they should be the new ruler and they couldn't agree on who should sit on the throne. That could cause a lot of problems!
Today, these laws are still important, but they're not as critical because most countries have a system in place for choosing the new ruler, like an election or a parliamentary vote. But the royal succession bills and acts are still there, just in case something goes wrong and the country needs to pick a new ruler quickly.