Okay kiddo, so you know how sometimes when grown-ups have disagreements with each other about work, they might have a protest outside the building where they work? Well, sometimes they use big balloons that look like rats to show their unhappiness with the people they are protesting against. This big balloon is called an inflatable rat.
The rat balloon is like a big, blow-up toy that gets inflated with air so it becomes a really big and scary-looking rat. The rat is used to show that the people the grown-ups are protesting against are being unfair or doing things that the protesters don't like. The rat is also used to try and get the attention of people passing by, so that they can see what the protest is about and maybe even join in if they want to.
So, the inflatable rat is kind of like a big sign that people can use to show their unhappiness with something or someone. But it's not a real rat, so you don't have to be scared of it!