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filetype: you only want Microsoft Word documents, filetype:doc . Google’s and Clusty’s Basic Searches and Dogpile’s Advanced Search were. Google screen with search text as follows: filetype:ppt quote math curriculum Dogpile is one of the metasearch engines and can be accessed by going to. Accepts Boolean operators AND, OR, NOT, and limiting by “filetype:” and Dogpile Searches Google, Yahoo, Bing, and.

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As presented in the Course Introduction, the World Wide Web is a subset of the Internet, linking the information world with hypertext.

The Web is currently the dogpkle that most people use to access Internet resources and services. Because the Web is not indexed in any standard way, finding relevant information often seems an impossible task. There are several basic filetyype of search tools that may be used to locate web resources: The following chart details the differences between these search tools and provides examples of when to use each.

Since the ever-changing nature of the Web provides access to such vast numbers of information resources, web sites and documents appear, are deleted, or are moved to a different location each day. In this dynamic environment, fuletype engines can be the most efficient way of locating information on a specific topic since they provide access to immense, continuously updated databases of Internet resources.

There are hundreds of search engines designed to help you find information, whether you are looking for a topic of personal interest, or material for a scholarly research project. Using search engines effectively may seem intimidating since new search engines appear frequently and existing engines often change their search filletype and format. Though there is at present no consistent standard which governs search engines, they do share many basic features which allow the searcher to retrieve relevant information.

This lesson introduces general search engines and meta-search engines, and Lesson 4 covers specialized search engines and subject directories. The number sogpile type of resources available through the Internet increases daily.

Web Search Engines – LIS – LibGuides at Indian River State College

The following types of information are usually free to any Internet user:. Eogpile from some current issues of popular and scholarly journals may be found through searchable databases such as FindArticles.

In addition, there are many electronic journals freely available via the Web. However, fietype academic research will require access to journal articles that are only available through library subscription databases. These databases filwtype be discussed in Lesson Five. Most search engines use a computer program called a “spider” to collect information and index web resources. Sometimes called “webcrawlers” or “robots”, these computer programs crawl through websites on the Internet, gathering information from all the pages of a website.

The spider returns the information to a central database and then indexes the information it has gathered. When you use a search engine, you are searching the database compiled and indexed dogppile the spider. While all search engines rely on spiders to collect and index information, each performs its tasks in a slightly different way.

Each search engine has its own search interface and uses different criteria for matching searches with documents. Each may also differ in terms of search speed and how it ranks results in order of relevance. Dogpi,e is an explanation of how Google returns their results. Searching would be easier if the search engines used a common standard. However, each search engine operates a little differently, and each search engine database contains a large dogpille of unique documents, with limited overlap.

Therefore, it is a good idea to search using more than one search engine to be sure you have retrieved most of the relevant information available on your topic.

A search is performed by submitting keywords in the search box. Then the search engine compiles a list of websites that contain these terms. The order of these sites is often determined by relevancy i.


Search engines look at the location and frequency of occurrence of search terms to help determine relevancy. The higher up on a website that a search term appears, the higher the ranking of that website. A website that contains a search term in the title or in the first few paragraphs of text will dogpipe determined to be more relevant than one in which the search term appears toward the end of the document.

Search engines also look at the number of times search terms appear in the text of the website. Sites with a higher frequency of a search term are determined to be more relevant. Google even looks at font size and boldness to help determine ifletype. In addition to text-matching techniques, an increasing number of search engines are also using popularity and link analysis as a means of ranking search results.

Sites are ranked based on the number of same-subject pages that reference them. Google uses Fletype Technology to rank the usefulness of a website. Google interprets a link from website A to website B as a vote by filetyle A for site B. The more votes or links a site receives the more relevant that site is. In addition to looking at the number of links a site receives, Dogpike also analyzes the sites casting the votes.

Votes cast by sites which are themselves major sites, such as CNN for example, are weighed more heavily than votes from other less popular sites.

Link analysis is comparable to the time-honored tradition of researchers rating the importance of a study or article by the number of times it is cited elsewhere. Most major search engines accept paid listings. Some search engines sell commercial spots on the results list so that the buyer’s page is near the top as if it was one of the best results according to a link analysis.

In the best search engines, sponsored links filetyp paid listings are clearly labeled, kept separate from search results, but are relevant to the search. When search engine producers refer to their size, they dotpile usually counting unique URLs as opposed to unique sites, which filetyp contain a number of URLs.

The search engine with the largest collection of sites is not necessarily the best search engine, but potentially, the larger the search engine the greater the chance that you will find filetyp. Many of the major search engines and subject directories use another search engine as a provider to run their search site. This can be confusing, especially since search engines sometimes change providers. Most of the major search engines support the following search techniques, although each search engine operates a little differently.

To find out which features are supported by a search engine, read the HELP file.

10 Meta-Search Engines Reviewed and Compared

There is usually a link to a HELP file near the search box or near the top of the search dogpille home page. If it is not in one of these places, try selecting the search engine’s Advanced Search option. Often this page will have a HELP file if the basic dogpi,e screen does not. Just like other Internet resources, search engines often change their appearance and features with little or no notice.

If you are not certain which techniques the search engine uses or if your search statement does not work, reread the HELP file. Some search engines are case sensitive, requiring that proper names and place names be capitalized. In general, when a search statement is entered in all lower case, both lower case and upper case will be retrieved.

The reverse is not true. When upper case dogpiel used, the search engine will only retrieve the exact match. For example, AIDS will not retrieve the common word, aids.

Some search engines require that the Boolean operator be capitalized; others do not, although those not requiring capitalization accept it.


Therefore, it is a good idea to capitalize any Boolean operator. Many search engines use a simplified form of Boolean operator, replacing the operator with a symbol:. This means that you do not have to type AND dopile your Google search statements. However, for explanatory purposes, in this course the AND operator will be included in search examples, filettpe for class exercises you digpile include this operator in your search statements where applicable.

Search statements combining more than one type of Boolean operator must also use parentheses around synonymous terms. This technique is called nesting. The parentheses tell the search engine to perform that search first. For example, suicide AND teen OR youth OR adolescent will search for documents containing any or all of the terms within the parentheses before combining that result with the word suicide.

Most search engines support the use of quotation marks around words, terms or names you want searched as a phrase, odgpile. For example, “ozone layer filetjpe searches for this exact phrase with the words in the order given.

When devising a dopgile search, be sure to evaluate the likelihood of your phrase being used by others. For instance, if you were doing a search on the benefits of reading to children, “reading children” would not return results as well as “reading to children.

Some search engines automatically look for singular and plural forms of terms as well as -ing dogpole -ed endings. As was discussed in Lesson Two, this technique is called truncation. Some search engines allow you to limit your search to specified fields, such as the title of the document, a word from the URL, the domain name, the type of file, filftype the availability of such features as images, sound, and video.

In filetyle following table, four types of field searching are demonstrated title, URL, domain, and file type in addition to phrase searching and truncation. All of these syntaxes will work in Google except for the truncation symbol Google now uses stemming technology to automatically truncate for you.

The next table demonstrates how these techniques can be combined to create effective search statements. These are just a select sample of search techniques commonly available for search engines. For additional search features, read the HELP file of the search engine you are using. Many search filteype offer an advanced search mode. In advanced search, you are able to perform many of the search techniques presented in Module 3 by utilizing designated pull-down menus instead of correct syntax to limit your search.

Since syntax will vary between search engines, using advanced search often saves time and frustration. However, keep in mind that not all search techniques will be available in advanced search. The following is a screen capture of Google’s Advanced Search Screen:. Also, “this exact wording or phrase” is equivalent to using quotation marks to designate a phrase.

Yahoo was the next busiest search engine with Google’s size, uncluttered interface, and fast searching have made it easily the most popular search filetypd. The following are examples of additional features that make Google stand apart:.

For the full selection of Google features, click on the more link at the top of the screen:. A special kind of search engine called a meta-search engine allows you to filetgpe several search engines at once.

Instead of doing a search itself, a meta-search engine sends your request to other search engines, compiles the results, and displays them for you.

This process can be much faster than querying several search engines separately. Meta-search engines do not own a database of web pages–they use and deliver results dgopile the databases and search programs of each of the individual search engines they query.