Starch is a type of carbohydrate that is commonly found in many different types of plants, such as grains, potatoes, and corn. It is a polymer made up of glucose units that are linked together by alpha-1,4-glycosidic bonds. Starch serves as an important energy source for many organisms, including humans.

In plants, starch is stored in specialized structures called plastids, which are found in various parts of the plant, such as the roots, leaves, and seeds. Starch can be broken down into glucose by enzymes called amylases, which are found in the digestive systems of many animals, including humans.

Starch is often used in food processing as a thickener or stabilizer. It is also commonly used in the production of bioplastics, which are plastics made from renewable resources such as cornstarch. Additionally, starch is used in the production of ethanol, which is a biofuel.