Product depth refers to the variety of options available within a specific product line. For example, a brand like Nike may offer multiple types of running shoes, each with different features, colors, and sizes. This variety allows consumers to choose products that best meet their individual needs and preferences. Having a deep product line can enhance customer satisfaction and loyalty, as it provides more choices. However, it can also complicate inventory management and marketing strategies. Companies must balance the benefits of offering diverse options with the challenges of maintaining a streamlined operation.