Online marketing is also known as internet marketing or web marketing. A key advantage of online marketing compared to traditional marketing such as print or TV is measurability of the impact. Examples for instruments and specific measures in online marketing are banner ads, pop-ups, layer ads, email marketing in newsletters, affiliate marketing through sales partners, Search Engine Marketing (SEM) as well as Search Engine Optimization (SEO). The combination of classical advertising with digital techniques is also possible. For example, a Quick Response Code (QR code) can be used on advertising letters or posters to enable direct access to products or digital services on the Internet, thereby linking the offline world with the online world.