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Search Engine Basics

University of Palestine. Search Engine Basics. Mo’ayyad ayesh u.n:120100033. Introduction:-.

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Search Engine Basics

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  1. University of Palestine Search Engine Basics Mo’ayyad ayesh u.n:120100033

  2. Introduction:- Anybody who has ever used the internet has had the opportunity to take advantage of a search engine at some point or another. Search engines are the first step for a smart Internet user who wants to find information on something particular or a certain type of website. Even if you are not especially experienced in the World Wide Web, search engine usage is one of the most basic skills to learn. If you can master the search engine, the rest is easy. Search engines have a comprehensive database of just about every website out there. They classify websites according to how relevant those sites are to certain search queries.

  3. Search Engine Basicsplan

  4. What is search engines • A web search engine is designed to search for information on the World Wide Web and FTP servers. The search results are generally presented in a list of results and are often called hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.

  5. What is search engines How web search engines work? There are at least three elements to search engines that’s are important: 1)information discovery & the database. 2)The user search. 3)The presentation and ranking of results.

  6. What is search engines • Discovery and Database: A search engine finds information for its database by accepting listings sent in by authors wanting exposure, or by getting the information from their "Web crawlers," "spiders," or "robots," programs that roam the Internet storing links to and information about each page they visit. Web crawler programs are a subset of "software agents," programs with an unusual degree of autonomy which perform tasks for the user. 2. User Search Most engines allow you to type in a few words, and then search for occurrences of these words in their data base. Each one has their own way of deciding what to do about approximate spellings, plural variations, and truncation. If you just type words into the "basic search" interface you get from the search engine's main page, you also can get different logical expressions binding the different words together.

  7. What is search engines 3. Presentation & Ranking: Most engines find more sites from a typical search query than you could ever wade through. Search engines give each document they find some measure of the quality of the match to your search query, a relevance score. Relevance scores reflect the number of times a search term appears, if it appears in the title, if it appears at the beginning of the document, and if all the search terms are near other; some details are given in engine help pages. Some engines allow the user to control the relevance score by giving different weights to each search word. One thing that all engines do, however, is to use alphabetical order at some point in their display algorithm. If relevance scores are not very different for various matches, then you end up with this sorry default.

  8. What is search engines Search engines divides into some categories:- • General: This type of site doesn’t have a particular type, Example: Google,ask,bing,yahoo,baidy ..Etc. 2) Business: as this site searches about the transactions of business as trade , buy and sell. Example: Business,Glopalspec,Thomasnet,Genieknows. 3)Medical : This engines searches about all things related with medical way...medicine,Herbs,medical consults.. Etc. 4)News:It’s related with all types of news (sports,political,economic..Etc.

  9. ADVANTAGES Search engines have big advantages and in opposite (disadvantages),form it’s much advantages we will recall some:- 1)variety: An Internet search can generate a variety of sources for information. Results from online encyclopedias, news stories, university studies, discussion boards, and even personal blogs can come up in a basic Internet search. This variety allows anyone searching for information to choose the types of sources they would like to use, or to use a variety of sources to gain a greater understanding of a subject.

  10. ADVANTAGES :2)precision Search engines do have the ability to provide refined or more precise results. Putting quotations marks around a set of words will bring up results with the exact same words, excluding others. Some search engines, such as Google or Yahoo, enable you to specify the type of web sources to be searched. Being able to search more precisely allows you to cut down on the amount of information generated by your search. Search engines within a website allow you to search information only on that website, filtering out information from other web sources and giving more precision in a user's search for information.

  11. ADVANTAGES :3)Organize Internet search engines help to organize the Internet and individual websites. Search engines aid in organizing the vast amount of information that can sometimes be scattered in various places on the same web page into an organized list that can be used more easily.

  12. Dis-ADVANTAGES 1. Too many website visitors Highly ranked websites receive significantly more visitors than those which are invisible to the search engines. In our experience, increases in visitor numbers from 200% to several orders of magnitude are normal. Large websites with lots of images / Flash / downloads may find their hosting provision needs increasing. This is normally only a problem with websites on very old host servers. Cost implications are minimal. It is likely that the amount of Spam received will also increase. This may be more of nuisance.

  13. Dis-ADVANTAGES 2.Too many website leads / sales This can be a major problem. With PPC (pay per click) advertising, if a business receives too may leads it is easy to pause the advertising and there will be an immediate drop in leads or sales. But it is not possible to quickly remove a highly ranked website from the search engines without causing long term damage to search engine ranking. We have sometimes intentionally allowed rankings to slip on our own website when sales enquiries are to high, but this is a very crude method and changes happen slowly.

  14. BRIEF-HISTORY • In 1957, after the U.S.S.R. launched Sputnik (the first artificial earth satellite), the United States created the Advanced Research Projects Agency (ARPA) as a part of the Department of Defense . • The very first tool used for searching on the Internet was called "Archie". (The name stands for "archives" without the "v"). It was created in 1990 by Alan Emtage, a student at McGill University in Montreal(KANADA). The program downloaded the directory listings of all the files located on public anonymous FTP (File Transfer Protocol) sites, creating a searchable database of filenames.

  15. BRIEF-HISTORY • While Archie indexed computer files, "Gopher" indexed plain text documents. Gopher was created in 1991 by Mark McCahill at the University of Minnesota. (The program was named after the school's mascot). Because these were text files, most of the Gopher sites became Web sites after the creation of the World Wide Web. • In 1993, student Matthew Gray created what is considered the first robot, called World Wide Web Wanderer. It was initially used for counting Web servers to measure the size of the Web. The Wanderer ran monthly from 1993 to 1995. Later, it was used to obtain URLs, forming the first database of Web sites called Wandex.

  16. IN MY OPINION I THINK SEARCH ENGINES ADVANTAGES IS MORE THAN DISADVANTAGES AND THIS INVENTION IN INTERNET WORLD HAD REDOUND IN HELPING ALL TYPES OF PEOPLES ,STUDENT ,TEACHER , EMPLOYMENT…ETC. THANKS..M-A

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