Search Engines

Understanding how search engines work, Google in particular, is important when working in SEO. The basics of crawling and indexing are amazingly useful to understand if you want to rank your own content.

Additionally, Google updates its algorithm several times a year. Understanding the more significant updates, and how they work, can help you to craft content and SEO strategies that are up-to-date.

We've written extensively about how search engines work, and included some of the top resources here. You can also browse the latest posts on search engines from the Moz blog below.

How Search Engines Work : New to SEO? Start with the basics of how search engines operate with our free beginner's guide.

Search Engine Ranking and Visibility : Learn the fundamentals of how search engines rank content on search engine result pages.

Google Algorithm Update History : A complete history of Google algorithm updates since 2000. This includes important links and references for understanding how Google works.

How Search Engines Value Links : Search engines work off a number of signals, but two of the most important are content and links. In this video, Rand Fishkin explains the basics of link evaluation.

MozCast : Is Google updating it's algorithm as we speak? MozCast is the Google algorithm weather report, so you can see how much Google results are changing each day.

Most Recent Articles on Search Engines

A Visit to GooglePlex Irvine
Rand Fishkin

A Visit to GooglePlex Irvine

A big thanks to Zachary Applegate from Plumber Surplus for contributing this blog on the subject of his team's recent visit to Google's Irvine complex. Hopefully you'll enjoy it as much as I have: While our small team from PlumberSurplus.com was excited to be able to go to the Google open house in their new Irvine California office, we were u...

Lord of Yahoo!'s Short Tail
Rand Fishkin

Lord of Yahoo!'s Short Tail

Someone has Yahoo!'s number down cold. Ranking on page one for thousands of the most popular search phrases in existence, the site isn't even offering content of its own - instead, they're aggregating content from others and serving what is, in essence, duplicated content that's been scraped and re-packaged. Their business model? Serving ads... What are they ranking for? phot...

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Top Ten Twisted Trends
Rand Fishkin

Top Ten Twisted Trends

I'm fairly sure this is exactly what the Google programming team had in mind when they created Trends - a list of geeky searches that produced humorous graphs. Here goes: #10 - Spending Christmas by YourselfFolks seem to be getting lonely around t...

The Yahoo! vs. AdSense Rumor
Rand Fishkin

The Yahoo! vs. AdSense Rumor

I keep getting bugs in my ear (or little birdies) dropping hints that Yahoo!'s organic search is predisposed against websites serving AdSense. That' s not to say that many sites serving the Google ads don't rank well at Yahoo!, but rather that Yahoo! has some negative associations with AdSense serving content and won't be as friendly as they should be. I've heard this rumor two way...

Google Trends is Awesome!
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Google Trends is Awesome!

Hey,If you have not seen Google Trends yet, better get over there right now and sniff around. It is exactly like Zeitgeist but you can type in any term that you want and see a whole lot of really cool data.For example....

Recipe Refinement Queries at Google
Rand Fishkin

Recipe Refinement Queries at Google

I couldn't find a good recipe for Chinese Beef & Broccoli at Epicurious this weekend, so I headed to Google, where, lo and behold, they have what appears to be another new feature - query refinement via recipes. I may have just been busy when the search blogs reported on this, but I can't seem to find it in archives at SEW or SERoundtable, either, so maybe it is new. Screenshot below for &q...

Sources for Search Engine Algorithm & IR Research
Rand Fishkin

Sources for Search Engine Algorithm & IR Research

Welcome to SEOmoz blog readers and SES NYC participants who may have seen me speak at the Search Algorithms session. You've reached the right page - congrats! The following is a list of useful resources for where to find information about patent applications, research that may affect search engine technology and algorithms and general data on the function of modern information retrieval engine...