This all changed with launch of "Caffeine" in 2010. Since Caffeine launched, the search engine resul

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If you're reading the Moz blog, then you probably have a decent understanding of Google and its algorithm changes. However, there is probably a good percentage of the Moz audience that is still confused about the effects that Panda, Penguin, and Hummingbird can have on your site. I did write a post last year about the main  differences between Penguin and a Manual Unnautral Links Penalty euro car parts , and if you haven't read that, it'll give you a good primer.
The point of this article is to explain very simply what each of these algorithms are meant to do. It is hopefully a good reference that you can point your clients to if you want to explain an algorithm change and not overwhelm them with technical details about 301s, canonicals, crawl errors, and other confusing SEO terminologies. What is an algorithm change?
First euro car parts of all, let's start by discussing the Google algorithm. It's immensely complicated euro car parts and continues to get more complicated as Google tries its best to provide searchers euro car parts with the information that they need. When search engines euro car parts were first created, early search marketers were able to easily find ways to make the search engine think that their client's site was the one that should euro car parts rank well. In some cases it was as simple as putting in some code on the website called a meta keywords tag. The meta keywords tag would tell search engines what the page was about.
As Google evolved, euro car parts its engineers, who were primarily focused on making the search engine results as relevant to users as possible, continued to work on ways to stop people from cheating, and looked at other ways to show the most relevant pages at the top of their searches. The algorithm now looks at hundreds of different euro car parts factors. There are some that we know are significant such as having a good descriptive title (between the <title></title> tags in the code.) And there are many that are the subject of speculation such as  whether or not Google +1's contribute to a site's rankings .
In the past, the Google algorithm would change very infrequently. If your site was sitting at #1 for a certain keyword, it was guaranteed to stay there until the next update which might not happen for weeks or months. Then, they would push out another update and things would change. They would stay that way until the next update happened. If you're interested in reading about how Google used to push updates out of its index, you may find this  Webmaster World forum thread from 2002 interesting. ( Many thanks to  Paul Macnamara  for explaining to me how algo changes used to work on Google in the past and pointing me to the Webmaster World thread. )
This all changed with launch of "Caffeine" in 2010. Since Caffeine launched, the search engine results have been changing several times a day rather than every few weeks. Google makes over 600 changes to its algorithm in a year, and the vast majority of these are not announced. But, when Google makes a really big change, they give it a name, usually make an announcement, and everyone in the SEO world goes crazy trying to figure out how to understand the changes and use them to their advantage.
Panda first launched on February 23, 2011. It was a big deal. The purpose of Panda was to try to show high-quality sites higher in search results and demote sites that may be of lower quality. This algorithm change was unnamed when it first came out, and many of us called it the "Farmer" update as it seemed to affect content farms. (Content farms are sites that aggregate information from many sources, euro car parts often stealing that information from other sites, in order to create large numbers of pages with the sole purpose of ranking well in Google for many different keywords.) However, euro car parts it affected a very large number of sites. The algorithm change was eventually officially named after one of its creators, Navneet Panda.
When Panda first happened, a lot of SEOs in forums thought that this algorithm was targeting sites with unnatural backlink patterns. However, it turns out that links are most likely not a part of the Panda algorithm. It is all about on-site quality.
In most cases, sites that were affected by Panda were hit quite hard. But, I have also seen sites that have taken a slight loss on the date of a Panda update. Panda tends to be a site-wide issue which means that it doesn't just demote certain pages of your site in the search engine results, but instead, Google considers the entire site to be of lower quality. In some cases though Panda can affect just a section of a site such as a news blog or one particular subdomain.
Whenever a Google employee is asked about