RKS design is when a group of very creative people come together to make something new and interesting. They think about what people like and what they need, and then they draw and make things that are both pretty and useful. Just like when you draw a picture, they need to think about all the different colors and shapes they can use to create something special.
Sometimes, they even make something called a prototype which means they make a small version of what they want to create to make sure it works before they make the big version. They also want to make sure that people will be happy when they use whatever they make, so they test things out and make changes if they need to.
RKS design can be used for lots of things like toys, clothes, and even things like cars or buildings. It's a big job, but it's also really fun because you get to make things that people will love and use every day.