1. Glycogen:

* This is the primary storage form of carbohydrates in animals, including humans.

* It's a highly branched polymer of glucose molecules.

* Stored mainly in the liver and muscles:

* Liver: Glycogen stored in the liver can be released into the bloodstream as glucose to maintain blood sugar levels between meals.

* Muscles: Muscle glycogen provides energy directly to the muscles during physical activity.

2. Starch:

* This is the primary storage form of carbohydrates in plants.

* It's also a polymer of glucose but is less branched than glycogen.

* Stored in plant cells, especially in seeds, tubers, and roots: These are the parts of the plant that serve as energy reserves.

Other forms of carbohydrate storage:

* Small amounts of glucose: Some glucose can be stored in the cytoplasm of cells in a dissolved form, but this is a very small amount compared to glycogen or starch.

It's important to note that the way carbohydrates are stored varies depending on the type of cell and the organism.