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

Google Search Bugs
J

Google Search Bugs

Dear Friends: I published a website earlier this year on the American folk song, Follow the Drinking Gourd. I closely tracked how the three major search engines handled the site, including how quickly the site was ranked, how many pages each of the three major engines found, how often they visited these pages, and h...

Level Up Your SEO Skills With Our Free Training

Moz Academy Training

Complete courses to master SEO basics

Keyword Research Master Guide

Learn Keyword Research like the pros

Guide to SEO Competitor Analysis

Win rankings and traffic from your competition

Remarkable Openness from Google's Black Box Thanks to Saul Hansel
Rand Fishkin

Remarkable Openness from Google's Black Box Thanks to Saul Hansel

I'm more than a little skeptical of mainstream media articles about the search engines. With so many terrible experiences - inaccuracy, bias, shallow information, agenda-based reporting - it's easy to see why. However, today I'm thrilled to see an article from Saul Hansel in the NY Times that's not only impeccably well-written, but informative to even those of in most deeply inside the search i...

Temporal Data & the Rankings Rollercoaster
Rand Fishkin

Temporal Data & the Rankings Rollercoaster

I noticed an engaging blog post from Stoney DeGeyter over at SearchEngineLand this evening (or rather, morning/afternoon for our American & European readers) - The Ranking Roller Coaster Cause & Effect. It's definitely worth a read, but I also wanted to point out one specific area that we see causing the "rollercoaster&quo...

Another day, another version of Google...
T

Another day, another version of Google...

There has been a lot of debate recently in "SEO News Land" (aka all the SEO blogs I subscribe to) about various testing Google has been doing. Particularly with how they treat the display of their paid ads.This morning I noticed something I hadn't seen before and no-one else in the office could re-create (on a side note - is it just co-incidence that they picked the one SEO...

Why does Google hate me?
V

Why does Google hate me?

Well, not me specifically - but my MySpace page.A few months back I googled the title of my MySpace page. Just out of curiosity. Surprisingly I was in the #1 position. I say it was surprising because the title of the page is "Unattached and Unavailable". Those are two common words that actually appear often enough online that you wouldn't thin...