A link farm is any collection of web sites that all hyperlink to every other site in the group. Although some link farms can be formed by hand, most are created through automated programs and services. A link farm is a structure of spamming the index of a search engine . Other link exchange systems are designed to allow individual websites to selectively exchange links with other related websites and are not considered a form of spamdexing.

Where link weighting is still believed by some Webmasters to influence search engine results with Google, Yahoo!, MSN , and Ask , link farms remain famous tool for increasing PageRank or perceived equivalent values. PageRank-like measurements apply only to the individual pages being linked to, so these pages must in turn link out to other pages in arrange for the link weighting to help.

The expression "link farm" has always carried with it a derogative reputation. Many reciprocal link management service operators advertise the value of their resource management and direct networking relationship building. The reciprocal link management services support their industry as an alternative to search engines for finding and attracting visitors to Web sites.

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