How the web search engine works

Google is designed to crawl and index the Web efficiently and produce much more satisfying search results than existing systems.

How the web search engine works

Initially, all webmasters needed only to submit the address of a page, or URLto the various engines which would send a " spider " to "crawl" that page, extract links to other pages from it, and return information found on the page to be indexed. A second program, known as an indexerextracts information about the page, such as the words it contains, where they are located, and any weight for specific words, as well as all links the page contains.

How the web search engine works

All of this information is then placed into a scheduler for crawling How the web search engine works a later date. Website owners recognized the value of a high ranking and visibility in search engine results, [6] creating an opportunity for both white hat and black hat SEO practitioners.

According to industry analyst Danny Sullivanthe phrase "search engine optimization" probably came into use in Sullivan credits Bruce Clay as one of the first people to popularize the term.

Meta tags provide a guide to each page's content. Using metadata to index pages was found to be less than reliable, however, because the webmaster's choice of keywords in the meta tag could potentially be an inaccurate representation of the site's actual content.

Inaccurate, incomplete, and inconsistent data in meta tags could and did cause pages to rank for irrelevant searches.

Early search engines, such as Altavista and Infoseekadjusted their algorithms to prevent webmasters from manipulating rankings. To provide better results to their users, search engines had to adapt to ensure their results pages showed the most relevant search results, rather than unrelated pages stuffed with numerous keywords by unscrupulous webmasters.

This meant moving away from heavy reliance on term density to a more holistic process for scoring semantic signals. Search engines responded by developing more complex ranking algorithms, taking into account additional factors that were more difficult for webmasters to manipulate.

Inan annual conference, AIRWeb, Adversarial Information Retrieval on the Web was created to bring together practitioners and researchers concerned with search engine optimization and related topics.

Inthe Wall Street Journal reported on a company, Traffic Powerwhich allegedly used high-risk techniques and failed to disclose those risks to its clients. Major search engines provide information and guidelines to help with website optimization. Relationship with Google Intwo graduate students at Stanford UniversityLarry Page and Sergey Brindeveloped "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages.

The number calculated by the algorithm, PageRankis a function of the quantity and strength of inbound links. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer.

Page and Brin founded Google in Although PageRank was more difficult to gamewebmasters had already developed link building tools and schemes to influence the Inktomi search engine, and these methods proved similarly applicable to gaming PageRank. Many sites focused on exchanging, buying, and selling links, often on a massive scale.

Some of these schemes, or link farmsinvolved the creation of thousands of sites for the sole purpose of link spamming. Some SEO practitioners have studied different approaches to search engine optimization, and have shared their personal opinions. Depending on their history of previous searches, Google crafted results for logged in users.

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Matt Cuttsa well-known software engineer at Google, announced that Google Bot would no longer treat nofollowed links in the same way, to prevent SEO service providers from using nofollow for PageRank sculpting.

In order to avoid the above, SEO engineers developed alternative techniques that replace nofollowed tags with obfuscated Javascript and thus permit PageRank sculpting. Additionally several solutions have been suggested that include the usage of iframesFlash and Javascript.

Designed to allow users to find news results, forum posts and other content much sooner after publishing than before, Google caffeine was a change to the way Google updated its index in order to make things show up quicker on Google than before. According to Carrie Grimes, the software engineer who announced Caffeine for Google, "Caffeine provides 50 percent fresher results for web searches than our last index Historically site administrators have spent months or even years optimizing a website to increase search rankings.

With the growth in popularity of social media sites and blogs the leading engines made changes to their algorithms to allow fresh content to rank quickly within the search results.

How do Internet search engines work? - Scientific American

Historically websites have copied content from one another and benefited in search engine rankings by engaging in this practice. However Google implemented a new system which punishes sites whose content is not unique.

The Google Hummingbird update featured an algorithm change designed to improve Google's natural language processing and semantic understanding of web pages. Hummingbird's language processing system falls under the newly recognised term of 'Conversational Search' where the system pays more attention to each word in the query in order to better match the pages to the meaning of the query rather than a few words [38].Search Engine Optimization Tools.

Since our site launched in we have offered webmasters a wide array of free SEO tools. Below you will find some of our most popular SEO tools sorted by category along with listings of other popular SEO tools we recommend from across the web.

Wondering how Google search works? Learn how Google looks through and organizes all the information on the internet to give you the most useful and relevant Search results in a .

This tool analyzes a web page reporting characteristics that search engines could consider SPAM. The Search Engine List is the web's most comprehensive list of major and minor search engines complete with links and abstracts describing each of the search engines.

You may browse them by category or find them by the alphabetical drop-down menu. You may also browse the Directory List as well. The directory list details the major web directories and is sortable by category.

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Google is the most popular search engine in the world. But while so many people use it, few actually get formal instructions on how to search with Google. Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for.

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