Shopping cart rate refers to the percentage of online shoppers who add items to their virtual shopping cart but do not complete the purchase. This metric is used by e-commerce businesses to measure the effectiveness of their online store in converting browsing customers into paying customers. A high shopping cart rate may indicate issues with the checkout process or pricing, while a low rate may suggest a need for better product descriptions or images. Ultimately, a successful shopping cart rate is one that leads to a high conversion rate and increased sales for the business.