tip on this please...wanna know how

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I notice some blogs with highlighted words...abd when you click on that certain word...it leads you to another page. I've tried to search this online...on how to do this on my blog, but I don't even know what it's called. How do you do this? Any tip please? This might help improve my blog...since I still don't earn a single cent...and it's sad because, I know of some, who started blogging recently, but are already earning :-(