Design science research is like building a toy. When you want to design a new toy, you don't just make it look cool, you also think about how it will work and what it will do. This is like the "design" part of design science research.
Then you make a plan, gather the materials you need, and start building the toy. You try different things, see what works and what doesn't, and make changes until you have a toy that looks good and does what it's supposed to. This is like the "science" part of design science research.
But you don't just stop there. You want to make sure that other kids will like your toy too, so you ask your friends to play with it and give you feedback. If they think something is missing or could be better, you go back to the drawing board and make changes until everyone is happy. This is like the "research" part of design science research.
So, design science research is a fancy way of saying that you want to make something new and exciting, but you also want to make sure it works well and that people will like it.