An electronic commerce tool (software or service) that is the user-interface for the customer to shop at online stores. It allows users to place items in a “shopping basket” and the cart remembers these items for a predetermined length of time. Extra features such as different color or size options, quantity of order, and matching item links can be found linked from the shopping cart. Once a shopper inputs his shipping address, taxes and shipping costs can also be tallied from within the shopping cart. For the merchant, the shopping cart also provides important information, which is often transparent to the shopper including a cart number to track the order, and a cookie to provide you with some limited tracking details about your customer.