When would this be useful? If your site has a blog with public commenting turned on, links within those comments could pass your reputation to pages that you may not be comfortable vouching for. Blog comment areas on pages are highly susceptible to comment spam. Nofollowing these user-added links ensures that you're not giving your page's hard-earned reputation to a spammy site.

With our FREE subscription plan you can use our complimentary SEO tools that available online.  Our Assisted SEO guides you through the online marketing mine field whilst giving you access to some of  best SEO tools available. Our full premium service does all the heavy lifting for you whilst still giving you access to premium tools should want to run your own audits.

John Lincoln is CEO of Ignite Visibility, one of the top digital marketing agencies in the nation and a 2017, 2018 and 2019 Inc. 5000 company. Lincoln is consistently named one of the top marketing experts in the industry. He has been recipient of the Search Engine Land "Search Marketer of the Year" award, named the #1 SEO consultant in the USA by Clutch.co, most admired CEO and 40 under 40. Lincoln has written two books (The Forecaster Method and Digital Influencer) and made two movies (SEO: The Movie and Social Media Marketing: The Movie) on digital marketing. He is a digital marketing strategy adviser to some of the biggest names in business.
When Googlebot crawls a page, it should see the page the same way an average user does15. For optimal rendering and indexing, always allow Googlebot access to the JavaScript, CSS, and image files used by your website. If your site's robots.txt file disallows crawling of these assets, it directly harms how well our algorithms render and index your content. This can result in suboptimal rankings.

Technical SEO optimizes the non-content elements of a website and the website as a whole to improve its backend structure and foundation. These strategies relate to: site speed, mobile friendliness, indexing, crawlability, site architecture, structured data, and security. Technical SEO improves both user and search crawler experience, which leads to higher search rankings.
Optimizing a website may involve editing its content, adding content, and modifying HTML and associated coding to both increase its relevance to specific keywords and remove barriers to the indexing activities of search engines like Google ,Yahoo etc.[citation needed] Promoting a site to increase the number of backlinks, or inbound links, is another SEO tactic. By May 2015, mobile search had surpassed desktop search.[3]
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