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

When Google Comes Up Number One for Your Domain Name
Rand Fishkin

When Google Comes Up Number One for Your Domain Name

SEOmoz's Q+A section has been a goldmine of eye-opening experiences for the entire staff, and never more so than when we see something so bizarre, so surprising, that it defies explanation. Tonight, we not only got to see one of these fascinating search riddles, we're actually able to share (a rare event as most domains with specific search problems ask to re...

Days of our Lives... and the Drama That Fills Them
G

Days of our Lives... and the Drama That Fills Them

With Rand and the crew AFK at SMX West </jealousy>...I figured it's freed up some time in the spotlight for a novice like myself. For those wondering, I'm not an SEO expert, or a CEO or anything like that, I'm an IT Manager for a medium sized company. I've learned and applied concepts learned from my membership here at SeoMoz and a few other locations and it is...

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

Complaining about Some Google Missteps
Rand Fishkin

Complaining about Some Google Missteps

I don't generally like to pick on Google, or anyone else in particular for that matter, but since the search giant is hitting on all cylinders, I think they can probably take a little nudge or two. I'm going to keep this short, sweet and to the point (and also very self-centric, because it's tough to effectively analyze everything that might have happened on someone else's site): ...

Is Google Trimming Its Index?
buybigtires

Is Google Trimming Its Index?

I was doing some routine research this morning, when I noticed a disturbing trend:Less search results for any given KW that I typed in. My search terms generally return results of 500k or more. Today, they return results of ~93k.So I did a search in the larger category. My search for "tires" turned up 5M results. Last week t...

Optimizing for Yahoo with the New Updates
D

Optimizing for Yahoo with the New Updates

I've been studying and somewhat practicing SEO for about 4 years--and I've never seen great descriptions of what works in Yahoo versus the other engines. In fact I haven't aggressively or consciously optimized for Yahoo EVER. Yet I was amazed to see that with the most recent update at the end of October '07, Y! had my main business site powerfully ranked with a ...

Yahoo! Panama - An Interview with Mona Elesseily
Rand Fishkin

Yahoo! Panama - An Interview with Mona Elesseily

It's sad that we don't cover the paid side of search marketing here at SEOmoz with more frequency, but with a little luck and some elbow grease (or, at least, borrowed expertise), I'm trying to dip our toe a bit deeper. Thus, it's with great pleasure that I welcome Mona Elesseily from Page Zero. Mona's a paid search guru, a fellow Northwesterner (albeit a Canadian one) and one of my favori...

Aggregate Detail on the Numbers from Google's October 2007 Toolbar PageRank Updates
MelGray

Aggregate Detail on the Numbers from Google's October 2007 Toolbar PageRank Updates

Just a little under two weeks ago, we received numerous reports that a very large number of sites had experienced a sudden drop in Page Rank. Many immediately began claiming that Google had rolled out an update for its rank formula to penalize for paid links. Others played down these reports offering that their own sites had experienced no change at all. How do...

Protect Your Brand Variation Keywords from Google
D

Protect Your Brand Variation Keywords from Google

Recently I have seen an increase in costs for our brand variation keywords, for example if “bluewidget” was our brand name I saw an increasing cost for “blue-widget” and “blue widget”. I checked this out by searching for “blue-widget” and “blue widget” and couldn’t see any other advertiser. Then, after 2 hours of head scratching I f...