An Introduction to Search Engines and Web Navigation by Mark Levene

By Mark Levene

This ebook is a moment version, up-to-date and multiplied to explain the applied sciences that support us locate details at the web.  se's and internet navigation instruments became ubiquitous in our daily use of the internet as a data resource, a device for advertisement transactions and a social computing instrument. additionally, during the cellular net we've entry to the web's providers once we are at the move.  This ebook demystifies the instruments that we use whilst interacting with the net, and provides the reader a close review of the place we're and the place we're entering into phrases of seek engine and internet navigation applied sciences.

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Data in a web site, as shown on the righthand side of Fig. 1 is arranged as a network of web pages each containing multimedia, such as text (natural language) and images (visual information), and hyperlinks which are embedded references linking web pages together. A company’s employees may all have home pages within the web site but the internal structure of the individual home pages may vary from employee to employee. A relational database is queried using SQL (Structured Query Language) while the web is queried using a search engine.

A web crawl is a task performed by specialpurpose software that surfs the Web, starting from a multitude of web pages and then continuously following the hyperlinks it encountered until the end of the crawl. uk. One of the intriguing findings of this crawl was that the Web has a bow-tie structure as shown in Fig. 4. The central core of the Web (the knot of the bow-tie) is the strongly connected component (SCC), which means that for any two pages in the SCC, a user can navigate from one of them to the other and back by clicking on links embedded in the pages encountered.

Such redundancy is not present in traditional corpora and makes the search engine’s task even more difficult. • The quality of web pages vary dramatically; for example, some web sites create web pages with the sole intention of manipulating the search engine’s ranking, documents may contain misleading information, the information on some pages is just out of date, and the overall quality of a web page 30 AN INTRODUCTION TO SEARCH ENGINES AND WEB NAVIGATION • • • • may be poor in terms of its use of language and the amount of useful information it contains.

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