As a Silos Manufacturer, share with you.Silos are towers or pits used to store grain on farms, pits or other closed structures where silage crops are compressed and stored as silage. Silos are commonly used for bulk storage of grain, coal, cement, carbon black, woodchips, food products and sawdust. Three types of silos are in widespread use today: tower silos, bunker silos, and bag silos.