Product depth refers to the variety of options available within a specific product line. For example, a brand of shoes may offer different styles, colors, and sizes, allowing customers to choose based on their preferences. This variety helps meet diverse consumer needs and can enhance customer satisfaction. A deeper product line can also lead to increased sales opportunities, as it attracts a wider audience. However, managing product depth requires careful planning and inventory management to ensure that all options are available without overwhelming customers or incurring excess costs.