CS-Cart add-on (or CS-Cart module) is the special addition that enables the specific functionality in the e-shop based on CS-Cart or Multi-Vendor. For example, placing graphic banners and leaving reviews about products are realized via the built-in add-ons. The default platform has 50+ add-ons included. Also, there are many companies that develop new add-ons for CS-Cart every day. These add-ons relate to all sides of e-store working from appearance (animation effects, additional images) to the major functionalities like automatical sending of the reminders about not finished orders or additional payment system integration).