Contextual advertising is a marketing tool that allows Internet users to display advertisements that match their interests. Relevance is the correspondence between the result and the expectation. For example: you entered the query “buy hardware” into the search bar. And the system will immediately give you a whole list of options with links to online stores. The topmost snippets - search results in the form of a small excerpt from the text information of the site will be marked with a small “Advertising” marker. The marker looks different in different search engines. For example, sometimes it can even be shortened to 2 letters “Ad” (in the English version of the browser).
On the territory of Runet and Ukrnet (abbreviated Russian-language and Ukrainian-language Internet), the most famous and popular are 2 search engines: Google and Yandex. Contextual advertising is one of the main sources of their income. Two systems that are part of global corporations were created specifically for managing advertising and interacting with advertisers: Google Adwords and Yandex Direct.
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