Final answer:
Big-box stores are large retail outlets selling many types of items under one roof and are not limited to online sales, large items, or bulk food packaging.
Step-by-step explanation:
Big-box stores are large retail establishments that sell a variety of different types of items under one roof. They are characterized by their large physical footprint and wide array of products, usually organized into departments such as dairy, meats, produce, bread, cereals, and so forth. Unlike online-only stores, such as Amazon in its early days, big-box stores offer in-person shopping experiences, with each aisle containing hundreds of products for customers to buy and consume. These stores are not focused on selling items online only, nor are they dedicated to selling very large items or food in big packages exclusively, though they may include such products as part of their extensive inventory.