Why hotspots are used in website advertising ?

Sometimes the designer may want to provide an invisible hyperlink. Or they may want to allow you to click on an image to jump somewhere else. It is possible to define an area on the web page that will let you jump to another page.

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the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)