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The archives are usually stored in such a way they can be viewed, read and navigated as they were on the live web, but are preserved as ‘snapshots'.

The repository only stores HTML pages and these pages are stored as distinct files.

A repository is similar to any other system that stores data, like a modern day database.

Web crawlers copy pages for processing by a search engine which indexes the downloaded pages so users can search more efficiently.

Crawlers consume resources on visited systems and often visit sites without approval.

This mathematical combination creates a problem for crawlers, as they must sort through endless combinations of relatively minor scripted changes in order to retrieve unique content. noted, "Given that the bandwidth for conducting crawls is neither infinite nor free, it is becoming essential to crawl the Web in not only a scalable, but efficient way, if some reasonable measure of quality or freshness is to be maintained." Given the current size of the Web, even large search engines cover only a portion of the publicly available part.

A 2009 study showed even large-scale search engines index no more than 40-70% of the indexable Web; As a crawler always downloads just a fraction of the Web pages, it is highly desirable for the downloaded fraction to contain the most relevant pages and not just a random sample of the Web.For example, a simple online photo gallery may offer three options to users, as specified through HTTP GET parameters in the URL.If there exist four ways to sort images, three choices of thumbnail size, two file formats, and an option to disable user-provided content, then the same set of content can be accessed with 48 different URLs, all of which may be linked on the site.Everybody loves online dating sites in fact there is a site that fits for you...if you are a Muslim then we have a if you are a Chinese then we have a are all a…There are several online dating sites available and it may be difficult choosing the best one. But If you are going to your exotis trip (Mexico, Thai and so on) - only Cupid Sites! Some online sites are OK Cupid, Mingle 2, and Date Hook Up.

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