Hello everyone!

newbie to SEO and have been trying to keep everything nice and ethical but I've seen on a couple of blogs today "incoming search terms" at the bottom of the blogs, then a bullet pointed list of search terms  beneath it.

So I had a quick search about the use of it and noticed wordpress has a plugin that automatic ally generates these "incoming search terms".

I ask is this a legitimate plugin or will this harm my blog? I assume it generally will as I can't see this being much use for the audience, rather it would be 100% for trying to lure in search engines.