Arguably one of the most crucial part of Online retail, the process of selling products online and on mobile through shops, 3rd party marketplaces like Amazon and Ebay, and other channels.. The conversion is the process of transforming or “converting” the user to a customer. This is not always a financial Purchasing an order online from a business or other seller.. Often, the conversion takes place when a visiting user requests a quote, fills out a contact form, or places an order. It can be revenue driven, but not necessarily. The conversion depends solely on what your organization has decided to track.