Algorithm of search engines
Study: How info is found on the web, how search engine provide it and how webmasters promote their websites.
Despite the huge sums invested in search engines, and their ubiquitous in front of Internet users, their algorithm is still something primitive which is based on keywords and various signals. Some are considering moving to a semantic search, ie a better understanding of the content of sites to associate it to queries in context. Could this work? To what extent can we understand what the user wants without a deep intrusion into his private life?
This study of search engines and SEO reports the current knowledge of algorithms and the effect on the ranking in search results pages. Google, Bing, Yandex, Yahoo, DuckDuckGo have common rules and peculiarities.
This knowledge of the algorithms is essential for the visibility of a site. Google evaluates them on the basis of statistics. If a site, perfectly interesting and useful, can be described by criteria generally attributed to spam sites, it will be penalized.
Note that this site in itself is designed according to my preferences and not on search engines. It is possible that the design does not comply with all the findings of this study.
How to find information on the Web.
Before turning to search engines, an overview of the different ways to find answers on Internet.
For engines themselves, see a list, and basic technologies to design them.
Descriptions based on patents, mainly granted to Google.
Ranking according to a Google patent
From a patent from Google about techniques for calculating search results, it showsand why a website goes to sandbox. Google attribute to each page a score to rank in the list of results that are relevant to a search. The PageRank is only a part of scores of pages.
- Criteria of search engine algorithms
Based on the safest sources, it is necessary to clarify some points on how the results are determined by search engines for avoiding misconceptions.
- Positive and negative criteria of the algorithm
Each aspect of the site and page design contribute to its ranking. Criteria are called "signals" by Google. An example of signal is the domain name. If a site has the penguin.gl domain, it will be well ranked on the penguin term with the same content.
- What we should know about PageRank
The older criterion.
- PageRank and nofollow
What is the real effect of the nofollow attribute?
- Bounce factor.
Does it influence results of search engine? How to lower the bounce factor?
To evaluate the freshness of documents.
A secret of Google's algorithm being revealed.
Patent about ranking document based on backlinks
Patent about user behavior and how they use backlinks.
Panda patent made simple
Simplified description, comparison with the real experience.
- Understanding Panda
A new major criterion for ranking.
- Panda update, facts and myths.
Misconceptions about the algo.
It is an alternative from Microsoft to the PageRank.
Evolution of the Google's algorithm since the origin
- Evolution of Google's SERPs and interface
- Changes in the page results.
Google works on its algorithm
Based in part on a NYT article by a reporter who visited the laboratory.
- Google mistakes
The choice tends to be reduced for users who are more often directed by Google to content farms. But other perspectives are possible near the too invasive engine.
Advices to webmasters
Google has made several tip sheets to the attention of webmasters, and held roundtables to inform them. All this information is listed below. Since the algorithm becomes more and more aggressive towards spams and uses approximate signals to identify them, we must know the way to cross this minefield.
Avoid black hat techniques (Alexa graph)
First steps in website optimization
Manual for optimizing pages, promoting a site. Advices from Matt Cutts to optimize a site for Google.
- Optimization for e-commerce
It is more difficult and requires more technical than sites with just textual content.
- Keyword strategy
Something crucial for a professional site. With a list of tools.
The most natural mean to get backlinks.
- Promoting a site
And getting independent links.
from Google to webmasters
Lot of questions from webmasters, the team at Google Webmaster Central answered all of them.
- Google SEO Report Card, a summary
Stats about optimizations on websites.
- 10 optimization rules recommended by search engines
Advices for a better ranking.
- 20 mistakes to avoid for seach engines
For the content of the site to be properly indexed and pages rightly ranked.
- Myths about Google and optimization
Google give us a list of false beliefs about the search engine.
- What is a black hole site?
To not add links to other sites is a wrong direction.
SEO for Bing
Advices to webmaster by the search engine.
Lot of answers about optimization for search engines.