CDK is a computer program that helps other computer programs work better. It's kind of like a helper that programmers can use to make their own programs easier to use and more powerful.
Imagine you have a bunch of toys in your toy box. Some of them are easy to play with, but others are hard to figure out. CDK acts like a special toy organizer that makes it easier to find and use your favorite toys. It can help you sort your toys by color or size, and it can even give you special tools to play with them in new and exciting ways.
For example, a programmer who wants to make a program that displays graphs or charts might use CDK to make it easier to draw and manipulate those graphics. Or a programmer who wants to create a program that runs on different types of computers might use CDK to make sure the program works the same way on each type of computer.
So, in short, CDK helps programmers create better and stronger computer programs by providing them with useful tools and resources.