What is a bar code primarily used for?

A bar code is primarily used for identifying products for sales scanning. When a bar code is scanned at points of sale, it allows the cash register system to quickly and accurately pull up the corresponding product information from the database, such as price and item details. This process not only speeds up the checkout experience for customers but also provides an efficient way for businesses to manage inventory and track sales.

While some secondary functions could indirectly relate to aspects like preventing product theft or displaying product information, these are not the primary purpose of a bar code. Its main role is to facilitate the identification of products in a retail setting, making sales processes smoother and more efficient.