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The nofollow attribute is a statement in the HTML code that tells crawlers not to include an outgoing link in the calculation of the link popularity and thus also in the calculation of the page rank of the linked page. Usually, advertising links are always marked as nofollow.
To mark an internal or external link individually as a nofollow, simply add the “rel” attribute of the link to nofollow. This looks like this in HTML:
<a href=”http://www.cofing180.com” title=”programming and seo” rel=”nofollow”>
Originally, Google’s nofollow statement was introduced in 2005 to allow webmasters and website owners to provide additional information to visitors to the site without letting their own linkjuice flow out uncontrolled. Also, the impact of link spam should be mitigated, which in content management systems like WordPress caused comment links to default to nofollow.
Meanwhile, the other relevant search engines – like Bing – have acknowledged the nofollow attribute and their crawlers are taking on the guideline.
In addition to the possibility to provide only a single link with nofollow, there is also the possibility to put all links with a meta-statement on nofollow. This meta-statement in the page header is implemented as follows:
<Meta name = “robots” content = “nofollow” />
The use of nofollow within the internal link structure is not advisable. In order to achieve an evenly uniform indexing of all single pages, only pages with nofollow should be linked, which should not be ranked.
Legal notices (imprint, data protection, terms and conditions, etc.) are linked by many webmasters through Nofollow links. However, I would not do this because these sites collect a lot of links within the site and thus get a lot of linkjuice which they can pass on to other sub pages. So that these bottoms do not come in the search engine index you should simply put the robots meta tag with noindex, follow.