Enterprises use various kinds of software for core business operations. Ecommerce refers to business transactions that are conducted electronically over a computer network. Ecommerce activities are classified as BC, CC, BG, and . When customers put items in their online shopping carts, the ecommerce site's server sends a(n) to the customer's computers containing the ID number of a shopping cart. The server also stores the ID number, along with a list of items purchased. Payment authorization is facilitated through a payment . Information systems are used to track and control the chain, which begins with raw materials shipped to a manufacturer, monitors finished goods shipped to distributors, and ends with merchandise delivered to customers. Enterprises also use applications to coordinate sales, marketing, and customer support. Data for these systems may originate from programs or from customer information collected during the sales cycle. is a suite of software modules that use a common database and a common user interface. These modules typically include applications for resources management, financial management, SCM, CRM, and manufacturing.