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A index o index is generally a directory in a specific order that is used for orientation purposes. In search engine terms, an index is the list of web pages that is issued by the search engine in response to a user's search request.

General information

The list that is displayed after entering a specific search request is called SERPs (Search Engine Result Pages). The search result lists form the index interface which is visible to users. The actual index is stored on numerous servers owned by the search engine operator. There are millions of websites that are linked to specific keywords and keyword combinations - similar to alphabetical indexes or tabs.

The exact algorithms that are used to build such an index are largely unknown or secret, but it is clear that website crawling is the first step in producing the index and that websites are tagged with a large number of information, such as PageRank, before exiting in response to a user request. One way to include a new web portal in a search engine index is register with the search engine operator.


If you enter a search definition such as "search engine optimization" in the Google or Bing search bar, you want to be shown relevant websites for this term. You will get two types of indices, the organic and the paid results. The payment index differs on Google (the search engine with the largest market share) with the results highlighted in yellow and their placement on the right or top of the screen. Other search engines such as Yahoo, Bing or also code the payment index or designate it with words (for example, ad) so that it can be distinguished from the organic index.

Organic Index

The organic index shows the ranking of a website calculated by the search engine. It is determined by a search engine proprietary algorithm after the web portal is crawled by the search engine spider. The higher the page appears in the search results list, the higher its ranking or positioning. The goal of the SEO industry is to rank as high a web portal as feasible in the listing through various optimization steps, so search engine guidelines are important.

Payment index

In contrast to this is the pay rate. Webmasters can make their website appear as a paid ad above organic search results. Search engines offer a number of specialized payment programs. For Google it is Google AdWords, for Yahoo and Bing it is BingAds on the Yahoo Bing network. Sorting the results it is not done by an automated procedurebut for paid programs and bid on keywords in the pay index. The higher the position in a paying index, the higher the bid will be in appropriate terms or combinations of terms.

Practical relevance

If you configure a web portal again, you have different options to add to the index. Google may be requested to crawl a web portal, for example ..[1]

Once Google has crawled a website for the first time, it can enter the indexing state. For this, you will need a google account in Google Webmaster Tools and to submit your web portal to Google. A sitemap in XML format will provide Google with more information on the structure of a website and is primarily recommended for larger web projects.

Relevance for SEO

A variety of means can be chosen to upload a web portal to the index. In terms of the payout rate, as already mentioned, you should bid on genuine keywords or longtail combinations. For the organic index, the process is much more complicated and a very important part of search engine optimization.

The accessibility and relevance of a web portal are noteworthy in this context. Accessibility or crawlability here refers to accessibility for search engine crawlers. These automated programs and algorithms analyze websites. For this to be feasible, they must meet various technical requirements. For example, the attributes of the Robots.txt file must be selected in such a way that the crawler can enter the web. Possible barriers such as JavaScript code in menus or redirects and error codes should be avoided. The Webmaster Technical Guidelines provide valuable tips for ensuring accessibility.

The second index ranking factor is the relevance of the web portal. The better your content responds to a search engine's request, the higher your ranking will be in the index. In this way, relevance can be equated to useful information for the user. There are several ways to change the relevance of a web portal, including quality content, clear infographics, or helpful videos that provide complete answers to user questions.


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