Keyword Stuffing is a technique for search engine optimization (SEO). The basic idea is to repeat some unnecessary keywords in your page in the meta tag and other place elsewhere in your page.
But repeating too much may signal the search engine that your page is exploiting with unnecessary keywords in the content. Another way to do so is to use CSS to display a bunch of keywords out of your visible area in the browser. The noscript of javascript is also a place to hide. There are actually lots of place to think of.
Because of this, some search engines may raise a red high if they detect this kind of violation, some search engines even do not use this technique for ranking anymore.
Things don't do with your Keywords!
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