RunningEffectiveInternetSearches-Bakentüniversitesi.pptVIP

Searching The Web Search Engines are computer programs (variously called robots, crawlers, spiders, worms) that automatically visit Web sites and, starting with the Home Page, they follow all the internal links in the site, visit every WebPage at the site and read every word on every page and create an index of these words. Running Effective Searches Browsing and Searching are not the same. When you browse, you navigate from one Web page to another by following links. When you search, you enter keywords in a search engine to display a list of pages that match the keywords. Word Index versus Subject Directory A Word Index database contains billions of pages and from each page hundreds, or even thousands of words, since a Word Index contains every main word (small words such as: in, at, on, etc. are not indexed) from every page it finds at a Website. The Google database contains every main word for 228.000 pages at the Baskent University websites. A Subject Directory is extremely small – it contains only basic Subject headings for a few main pages at each Website. For example, the Google Subject Directory database contains only the Subject category and page Titles of about 54 pages at the Baskent University websites. Searching for Data Ranking The positioning of a Web page on the results page is called a site’s ranking. The order of the ranking will vary according to which search engine is used. Search engines only examine their own databases. Search Engines Differ Because they: use different Web robots (spiders) to collect information choose different Web pages to index interpret search expressions differently store a different amount of text from a Web page in the database Word Limiters The minus ( - ) sign means a word must not be on the results page. if you want to be sure that the words are found in the results then put a plus ( + ) sign before the word. Phrase Matching ( ) Putting quotes around a set of words will only find results that match the words in