Coverage in the online sector is increasing rapidly and steadily, since every person with Internet access is a potential contact. It is fundamentally easier to measure than, for example, in print media. The fact that someone buys a newspaper does not ultimately tell you whether the person has read the ad, whereas in online advertising there are many more ways to determine and evaluate coverage. In fact, nowadays you have various analysis and tracking tools that can check the exact surfing behavior of users, from the duration of visits to the type of usage. One of the best-known tools for this purpose is Google Analytics.