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Underlinking and Link Exchange

The opposites of overlinking are null linking and underlinking, which are phenomena in which hyperlinks are reduced to such a degree as to remove all pointers to a likely-needed context of an unusual term, in the text-area where the term occurs.

Underlinking results whenever a reader encounters an odd term in an article (perhaps not even for the first time), and wants to briefly browse more deeply at that point, but he or she cannot without an extensive search of the article for a (possibly non-existent) instance of the linked term.

The extreme case of underlinking is a dead-end page, a page with no links at all. Usability experts discourage making dead-end pages.

Underlinking also occurs when web pages use the rel=nofollow attribute to prevent search engines from considering these links when performing link analysis, weighting or ranking. Wikipedia is a well known example of this kind of underlinking.

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