Penguin Update
This algorithm’s primary purpose is to look for over-optimization factors on
website pages and other factors such as linking. This algorithm is more of a shakeup
algorithm. It runs periodically to shake things up and other algorithms that run later
actually reverse most of the effects of this algorithm within two to four weeks.

Penalty Algorithms
These are algorithms that are run by Google that penalize websites based on certain
criteria. Such criteria as links from porn or hate websites, links from certain identified
paid link farms, unnatural link building, negative reviews, negative PR, duplicate content,
high bounce rates which can indicate that that visitors were not finding what they were
searching for on the website and the visitor left quickly, and many other factors.
Google has many of these and some run just once, some run once a year, and some run
all the time.
Domain Name MatchThis is an algorithm we began in the summer of 2012 when Google announced the
algorithm to scare people from getting or using keyword matching domains. What does
this mean? Say you have a roofing company in Miami and people search on Google for
“Miami roofing company”. To help you in Google’s results, you buy the domain name
Miami RoofingCompany.com to help you become relevant for that key term. Google uses
this algorithm to make that domain name drop in its results for the keyword.

This is really another algorithm that runs to shake things up. Google wants to be the
phone book for the Internet. The problem with this algorithm for Google is that when the
algorithm runs, many of the domains that are exact matches are well known brand names
and Google has really had to turn this algorithm down and it is not very effective.
Manual Intervention
This is something new. It is a process where Google’s technical team members can
give a manual penalty to a website for just about any reason or take a penalty away. Most
are websites that are given penalties are for bad press, bad PR, or using paid linking or
link farms.
Hummingbird Algorithm
This algorithm made headlines and so much misleading information was written about
this algorithm and what it does. In October of the year it came out, Matt Cutts form
Google admitted that it has nothing to do with SEO and works to help with full sentence
searches most often used with voice searches.
PDF Algorithm
Believe it or not there is an algorithm that gives PDFs with a keyword relevance
enough to make it on to the first page.

NOTE: Each algorithm takes a tremendous amount of processing power and must filter against billions
and billions of items in Google’s databases. Most only run periodically and some only run a few times a
year.