Clocking is a considered as a black hat (spamdexing)technique in which the webpage is tailored/ designed in a way that the webpage will appear in different format to the end user and the search bots. The main objective is to manipulate google algorithm and to trick the bots in believing theta the content on the website is of high vale to a specific topic, where as the end user will be presented with a different content.
This approach is mainly use by substandard websites to drive general traffic to their websites. In most cases the user experience with these websites will be much lesser, resulting in high bounce rate.
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