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Buying and selling of products through internet which uses advance networking technologies is called E-commerce. Computer Scientists and engineers have designed "enablers" to which facilitate online shopping, online secure payment gateway and shopping cart software to conduct e-commerce. Almost all online store software have shopping cart software as part of it which act as the backbone for shopping portals.

The main function of an online shopping cart is to keep track of the items selected by an online buyer and the total amount to be billed for checkout purpose. In a way, it is similar to the billing software used by supermarkets across the world. It is analogous to the trolleys we are so accustomed to using in supermarkets.

online shopping cart icon is shown at the bottom of each product image, generally below the marked price in the web page. The shopper goes through the product listings and product descriptions in the online shopping portal and if he decides to purchase a particular item on sale, he/she will mark that item and drag or select that item using the online shopping cart icon.

In the shopping cart panel of the webpage, the item selected, its product code, its price, discount if any etc. is displayed. In case, the customer wishes to buy some other products as well, he can go through the product listings and add them to the shopping cart which already has one item which was previously selected by the customer.

Developing software specifically tailored to a client's needs is a complicated task. Needs such as accounts and billing, database management, and secure payment gateway must be taken into consideration. Proper software design requires that the developers be fully familiar with the profile and mode of operation of the client. This will guarantee a custom design with full functionality and ensure the satisfaction of the client.

Cookies in Hypertext Markup Languages (HTML) or query strings are the technology used by shopping cart software. There are two basic types of shopping cart software currently on the market. One type is available for a one time licensing fee. This type allows unlimited use after the payment of the fee. Also available is shopping cart software that requires a subscription fee. The subscription fee also covers hosting.