Here you can read more about making sales, especially online. According to the definition of turnover, it is the quantity of purchases or orders multiplied by the sum of the individual transactions. If you subtract the costs, you are left with the net turnover. Companies with a high turnover sometimes also have high costs, for example at an import or export company. Thanks to the internet, numerous new revenue models have emerged, including the online subscription model, online advertising model and the data model. By collecting customer and behavioral data, relevance becomes possible, which can lead to value creation. A commonly used way is first creating a relevant service, growing an audience and only then researching revenue models.