Well, kiddo, the French throne is a special chair that kings and queens sit on to rule France. But you see, not just anyone can sit on it. It has to be passed down to them from their family. This is called succession.
In France, it used to be that the oldest son of the king or queen would automatically become the next ruler. But things changed over time. In 1830, the French people decided that they wanted a king who would be fair and just, not just someone who was born into the royal family. After all, being born into a family doesn't automatically make you a good ruler, does it?
So after that, it was decided that the French monarch would be chosen by the people, rather than simply by birth order. But the monarchs had to come from a specific family, called the House of Bourbon.
Unfortunately, France no longer has a monarchy. This means that there is no one who is currently in line for the throne as there is no throne to inherit. The government of France is now a republic, with an elected president to lead the country.
So that's it, kiddo. The French throne is a special chair, but no one is sitting on it right now because France doesn't have a monarch anymore.