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Why Google Does Not Crawl & Index Every URL

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Why Google Does Not Crawl & Index Every URL


John Mueller of Google wrote a very detailed and honest explanation on why Google (and third party SEO tools) do not crawl and index every URL or link on the web. He explained that crawling is not objective, it is expensive, it can be inefficient, the web changes a lot, there is spam and junk and all of that has to be taken into account.

John wrote this detailed response on Reddit answering why “Why SEO tools don’t show all backlinks?” But he answered it from a Google Search perspective. He said:

There’s no objective way to crawl the web properly.

It’s theoretically impossible to crawl it all, since the number of actual URLs is effectively infinite. Since nobody can afford to keep an infinite number of URLs in a database, all web crawlers make assumptions, simplifications, and guesses about what is realistically worth crawling.

And even then, for practical purposes, you can’t crawl all of that all the time, the internet doesn’t have enough connectivity & bandwidth for that, and it costs a lot of money if you want to access a lot of pages regularly (for the crawler, and for the site’s owner).

Past that, some pages change quickly, others haven’t changed for 10 years — so crawlers try to save effort by focusing more on the pages that they expect to change, rather than those that they expect not to change.

And then, we touch on the part where crawlers try to figure out which pages are actually useful. The web is filled with junk that nobody cares about, pages that have been spammed into uselessness. These pages may still regularly change, they may have reasonable URLs, but they’re just destined for the landfill, and any search engine that cares about their users will ignore them. Sometimes it’s not just obvious junk either. More & more, sites are technically ok, but just don’t reach “the bar” from a quality point of view to merit being crawled more.

Therefore, all crawlers (including SEO tools) work on a very simplified set of URLs, they have to work out how often to crawl, which URLs to crawl more often, and which parts of the web to ignore. There are no fixed rules for any of this, so every tool will have to make their own decisions along the way. That’s why search engines have different content indexed, why SEO tools list different links, why any metrics built on top of these are so different.

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I felt it would be good to highlight this because it is useful for SEOs to read this and comprehend it.

Forum discussion at Reddit.



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SEARCHENGINES

Aurora Morales Recording Again in A Real Google Studio

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Aurora Morales Recording Again in A Real Google Studio

Aurora Morales of Google has done a nice number of videos for Google, specifically on the publisher monetization front. She did a nice number of those while at home since COVID. She now said she is back for the first time in a real Google studio recording.

She wrote on Twitter “Filming at an actual studio again (and not remotely from my apartment) has felt truly amazing. More policy video content coming.”

This is good to see – I was in one of these studios and they are the real deal.

This post is part of our daily Search Photo of the Day column, where we find fun and interesting photos related to the search industry and share them with our readers.



Source: www.seroundtable.com

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