Here's the breakdown:

* DNA is the genetic material that contains the instructions for building and maintaining an organism. It's like a blueprint.

* RNA is a molecule that helps to translate the information in DNA into proteins, which carry out the instructions. It's like a messenger.

* Chromosomes are structures made of tightly coiled DNA and proteins. They carry the genes, which are segments of DNA that contain the instructions for specific traits.

Think of it this way:

* DNA is the book containing all the recipes.

* RNA is the chef who reads the recipes and uses them to make food (proteins).

* Chromosomes are the shelves that hold the books (DNA).

So, DNA and RNA are involved in the process of creating and using genetic information, but they are not chromosomes themselves.