Search Engine Optimization and Placement Services

Google is constantly updating their services, top better understand what they do and how they do itr see below extracts from their own web site, note the dates and the latest extracts ONLY are deemed to be accurate descriptions today, or follwo the link to their current explanation:

AS of 3/25/2011 From http://www.google.com/corporate/tech.html

Search

Co-founder Larry Page once described the “perfect search engine” as something that “understands exactly what you mean and gives you back exactly what you want.” We can’t claim that Google delivers on that vision 100 percent today, but we’re always working on new technologies aimed at bringing all of Google closer to that ideal.

Before you even enter your query in the search box, Google is continuously traversing the web in real time with software programs called crawlers, or “Googlebots”. A crawler visits a page, copies the content and follows the links from that page to the pages linked to it, repeating this process over and over until it has crawled billions of pages on the web.

Next Google processes these pages and creates an index, much like the index in the back of a book. If you think of the web as a massive book, then Google‘s index is a list of all the words on those pages and where they‘re located, as well as information about the links from those pages, and so on. The index is parceled into manageable sections and stored across a large network of computers around the world.

When you type a query into the Google search box, your query is sent to Google machines and compared with all the documents stored in our index to identify the most relevant matches. In a split second, our system prepares a list of the most relevant pages and also determines the relevant sections and bits of text, images, videos and more. What you get is a list of search results with relevant information excerpted in “snippets” (short text summary) beneath each result.

As Larry said long ago, we want to give you back “exactly what you want.”

Describing the basic crawling, indexing and serving processes of a search engine is just part of the story. The other key ingredients of Google search are:

• Relevance. As Larry said long ago, we want to give you back “exactly what you want.” When Google was founded, one key innovation was PageRank, a technology that determined the “importance” of a webpage by looking at what other pages link to it, as well as other data. Today we use more than 200 signals, including PageRank, to order websites, and we update these algorithms on a weekly basis. For example, we offer personalized search results based on your web history and location.
• Comprehensiveness. Google launched in 1998 with just 25 million pages, which even then was a small fraction of the web. Today we index billions and billions of webpages, and our index is roughly 100 million gigabytes. We continue investing to expand the comprehensiveness of our services. In 2007 we introduced Universal Search, which made search more comprehensive by integrating images, videos, news, books and more into our main search results.
• Freshness. In the early days, Googlebots crawled the web every three or four months, which meant that the information you found on Google typically was out of date. Today we’re continually crawling the web ensuring that you can find the latest news, blogs and status updates minutes or even seconds after they’re posted. With Realtime Search, we’re able to serve up breaking topics from a comprehensive set of sources just moments after events occur.
• Speed. Our average query response time is roughly one-fourth of a second. In comparison, the average blink of an eye is one-tenth of a second. Speed is a major search priority, which is why in general we don’t turn on new features if they will slow our services down. Instead, search engineers are always working not just on new features, but ways to make search even faster. In addition to smart coding, on the back end we’ve developed distributed computing systems around that globe that ensure you get fast response times. With technologies like autocomplete and Google Instant, we help you find the search terms and results you’re looking for before you’re even finished typing.

The following is an extract from Google's website as of 05/25/05

This explains how Google ranks your page!

Technology Overview

Google stands alone in its focus on developing the "perfect search engine," defined by co-founder Larry Page as something that, "understands exactly what you mean and gives you back exactly what you want." To that end, Google has persistently pursued innovation and refused to accept the limitations of existing models. As a result, Google developed its own serving infrastructure and breakthrough PageRank™ technology that changed the way searches are conducted.

From the beginning, Google's developers recognized that providing the fastest, most accurate results required a new kind of server setup. Whereas most search engines ran off a handful of large servers that often slowed under peak loads, Google employed linked PCs to quickly find each query's answer. The innovation paid off in faster response times, greater scalability and lower costs. It's an idea that others have since copied, while Google has continued to refine its back-end technology to make it even more efficient.

The software behind Google's search technology conducts a series of simultaneous calculations requiring only a fraction of a second. Traditional search engines rely heavily on how often a word appears on a web page. Google uses PageRank™ to examine the entire link structure of the web and determine which pages are most important. It then conducts hypertext-matching analysis to determine which pages are relevant to the specific search being conducted. By combining overall importance and query-specific relevance, Google is able to put the most relevant and reliable results first.

* PageRank Technology: PageRank performs an objective measurement of the importance of web pages by solving an equation of more than 500 million variables and 2 billion terms. Instead of counting direct links, PageRank interprets a link from Page A to Page B as a vote for Page B by Page A. PageRank then assesses a page's importance by the number of votes it receives.

PageRank also considers the importance of each page that casts a vote, as votes from some pages are considered to have greater value, thus giving the linked page greater value. Important pages receive a higher PageRank and appear at the top of the search results. Google's technology uses the collective intelligence of the web to determine a page's importance. There is no human involvement or manipulation of results, which is why users have come to trust Google as a source of objective information untainted by paid placement.

* Hypertext-Matching Analysis: Google's search engine also analyzes page content. However, instead of simply scanning for page-based text (which can be manipulated by site publishers through meta-tags), Google's technology analyzes the full content of a page and factors in fonts, subdivisions and the precise location of each word. Google also analyzes the content of neighboring web pages to ensure the results returned are the most relevant to a user's query.

Google's innovations don't stop at the desktop. To bring its accurate and speedy search results to users accessing the web through portable devices, Google also pioneered the first wireless search technology for on-the-fly translation of HTML to formats optimized for WAP, i-mode, J-SKY, and EZWeb. Currently, Google provides its wireless technology to numerous market leaders, including AT&T Wireless, Sprint PCS, Nextel, Palm, Handspring, and Vodafone, among others.

 

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