Okay kiddo, you know what a billboard is right? It's a big sign that you see on the side of the road. Now, sometimes these billboards have ads on them, like for a fast food restaurant or something like that. But some people think that these ads can make us want to eat unhealthy foods too much. So, some grown-ups came up with an idea to use graffiti artists to make art on these billboards instead of ads for unhealthy foods.
Graffiti artists are people who use spray paint to make really cool pictures and designs. They're like the artists you learn about in school, but instead of painting on a canvas, they use walls and other surfaces as their canvas. These artists can make the billboards look really nice and pretty by painting their artwork on them.
So, by using these graffiti artists to make art on the billboards, the grown-ups hope to promote more positive messages, like staying active and eating healthy. They want to show that eating healthy can be fun and delicious too!
So, that's the basic idea. Instead of showing us ads for unhealthy foods, they want to show us cool art that can inspire us to make better choices!