Keyword stuffing is known as an unethical search engine optimization technique that involves adding an excessive amount of keywords into the HTML or tags of a webpage to bring more traffic to a website. While considered obsolete and outdated, there are still websites that attempt to use this technique and end up being blacklisted or banned from search engines. Search engines are now well equipped to deal with that sort of unethical SEO technique. For example, Google, one of the main search engines, has parameters that check for keyword stuffing hidden away from the eyes of the casual website viewer.

Hiding keyword stuffing from the sight of webpage visitors can be accomplished in a couple of ways if keyword stuffing is used. While it no longer works, webpages still attempt to hide keywords in different ways. These ways included:

Coloring text the same as the background color
Positioning text far away from the center of the webpage
Putting text behind a picture so that it cannot be seen

Yet, search engines have been able to spot keyword stuffing on websites since 2005. As the theme and content are now judged on websites, and not just what words appear, search engines have all but erased keyword stuffing from the Internet.