Spamdexing is a technique that artificially increases the relevancy of the web sites, thus increasing the potential position of a site on the search engines listings, but decreasing the quality of the search engine's database. This term is also used for sending of unsolicited bulk electronic mail. Stuffing a Web page full of words in the hope of making it high on the list for search engine spiders. Sometimes a Web page will have a list of many words, or the same word repeated many times, with the text in the same colour as the background. The link exchange systems are designed to allow individual websites to selectively exchange Links with other relevant websites and are not considered a form of spamdexing.

Some techniques that are often considered to be spamdexing are:

* Inserting keywords that are the same colour as a page's background (invisible keywords)
* Adding keywords that have nothing to do with the page to the meta tags
* Repeating keywords (or keywords stuffing)
* Webpage hijacking (pagejacking)
* Abusive use of domain and sub-domain aliases. Submitting contents under different domain names is not allowed by most search engines and directories.
* Over indexing pages in search engines

Spamdexed Web pages will be rejected by search engines.