Trading on the Internet (online trading, online shopping, etc.) has grown rapidly over the last few years. A large number of goods and (digital) products are offered for sale on the Internet. Internet auctions are also particularly popular. Often, the possibilities presented by a web shop are also used for marketing purposes. Depending on the participants - B2C – Business-to-Consumer or B2B – Business-to-Business -, electronic trading can be designed to meet individual requirements.