Browse Definitions :
Definition

nofollow

Contributor(s): Matthew Haughn

Nofollow is a meta tag that can be added to a site’s robots.txt file or to individual links to stop search engine webcrawlers from following links on the page.

Normally, webcrawlers follow links to index web pages and tally the links as votes for a site’s quality. The scores of links tag directs the crawler not to do that. As a result, those links are not included in the tally and have no effect on the page’s rank in search engine results pages (SERP).

Webmasters use nofollow to keep crawlers from following links on their pages to locations where spammers are likely to strike. (However, because very cost-effective scripts post many of these links, this does not prevent link spam.) The nofollow tag also helps assure that the search engine does not assume any association between the page where the link appears and the page that the link leads to. A webmaster might use the tag on a paid link to prevent a search engine considering it spam and designating their site and any linked sites a bad neighborhood. Alternatively, a webmaster might use nofollow when they purposely link to a page to demonstrate something negative, such as a terrible design or spammy content, without the link being considered an endorsement.

Initially, link spam resulted from the way that search engines used to assess page rank. As blogs rose in popularity, they also became a frequent location for spammers to drop unrelated promotional links in comments. Spammers added large numbers of links, often with spamming scripts known as spambots. The volume of links could improve the page rank for unscrupulous sites, allowing them to rise in visibility and popularity. To combat this problem, blog software makers collaborated with Microsoft, Google and Yahoo to create the nofollow tag.

Webcrawlers such as Googlebot create an index of a site within the limitations set forth by webmasters in their robots.txt files. Should a webmaster wish to keep pages from being tallied by search engines, they can block webcrawlers in a robots.txt file at the top-level folder of the site. To prevent crawlers from following any links on a given page of a site, they can include the nofollow meta tag for the page in this file; to prevent the bot from following individual links, the webmaster can add rel="nofollow" to individual links.

This was last updated in June 2017

Continue Reading About nofollow

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • regulatory compliance

    Regulatory compliance is an organization's adherence to laws, regulations, guidelines and specifications relevant to its business...

  • Whistleblower Protection Act

    The Whistleblower Protection Act of 1989 is a law that protects federal government employees in the United States from ...

  • smart contract

    A smart contract, also known as a cryptocontract, is a computer program that directly controls the transfer of digital currencies...

SearchSecurity

  • RSA algorithm (Rivest-Shamir-Adleman)

    The RSA algorithm is the basis of a cryptosystem -- a suite of cryptographic algorithms that are used for specific security ...

  • remote access

    Remote access is the ability to access a computer or a network remotely through a network connection.

  • IP Spoofing

    IP spoofing is the crafting of Internet Protocol (IP) packets with a source IP address that has been modified to impersonate ...

SearchHealthIT

SearchDisasterRecovery

  • virtual disaster recovery

    Virtual disaster recovery is a type of DR that typically involves replication and allows a user to fail over to virtualized ...

  • tabletop exercise (TTX)

    A tabletop exercise (TTX) is a disaster preparedness activity that takes participants through the process of dealing with a ...

  • risk mitigation

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a data center.

SearchStorage

  • disk array

    A disk array, also called a storage array, is a data storage system used for block-based storage, file-based storage or object ...

  • enterprise storage

    Enterprise storage is a centralized repository for business information that provides common data management, protection and data...

  • optical storage

    Optical storage is any storage type in which data is written and read with a laser. Typically, data is written to optical media, ...

Close