More specifically, glycogen is a polysaccharide, which means it's a complex carbohydrate made up of many sugar molecules linked together.

Here's why it's considered a carbohydrate:

* Composition: Glycogen is made up of glucose molecules, which are simple sugars (monosaccharides).

* Function: Carbohydrates are the body's primary source of energy, and glycogen serves as a storage form of glucose in animals, including humans.

Let me know if you have any other questions!