One of the most obvious and unfortunate spamming techniques, keyword
stuffing, involves littering repetitions of keyword terms or phrases
into a page in order to make it appear more relevant to the search
engines. The thought behind this - that increasing the number of times a
term is mentioned can considerably boost a page's ranking - is
generally false. Studies looking at thousands of the top search results
across different queries have found that keyword repetitions play an
extremely limited role in boosting rankings, and have a low overall
correlation with top placement.
The engines have very obvious and effective ways of fighting this.
Scanning a page for stuffed keywords is not massively challenging, and
the engines' algorithms are all up to the task. You can read more about
this practice, and Google's views on the subject, in a blog post from
the head of their web spam team -
SEO Tip: Avoid Keyword Stuffing.
Source:
moz.com
