A keyword can simply be any word on a Web page. Keywords would actually tell a user something about the subject and content of the Web page.
Search engines cannot return hits on keywords that mean the same, but are not actually entered in your query . A query on heart disease would not return a document that used the word "cardiac" instead of "heart."
Full-text indexing systems generally pick up every word in the text except commonly occurring stop words such as "a," "an," "the," "is," "and," "or," and "www." Some of the search engines discriminate upper case from lower case; others store all words without reference to capitalization.
To be or not to be . Some search engines choke because all the words in the phrase are stop words -- i.e., unimportant words too short and too common to be considered relevant strings on which to search.
However, if you enclose the query in quotation marks, forcing the search engine to find the words, "to be or not to be" in that precise order, most search engines can recognize the phrase as a famous quotation from Hamlet .
A social search engine is a type of search engine that determines the relevance of search results by considering the interactions or contributions of users. Example forms of user input include social bookmarking or direct interaction with the search results such as promoting or demoting results the user feels are more or less relevant to their query. (source: Wikipedia)
Wink is a community-based social search engine. It provides across social networks, and Web search based on user input. Wink is different from conventional search engines in that the relevant results are derived not just from machine algorithms, but directly from user input, such as social bookmarking , voting up or down, or blocking results that are considered to be spam, thus allowing users to collectively create their own search engine.
In a meta-search engine, you submit keywords in its search box, and it transmits your search simultaneously to several individual search engines and their databases of web pages. Within a few seconds, you get back results from all the search engines queried.
clusty.com Currently searches a number of free, search engines and directories, not Google or Yahoo.
Accepts and "translates" complex searches with Boolean operators and field limiting. Results accompanied with subject subdivisions based on words in search results, giving usually the major themes. Click on these to search within results on each theme.
A meta-search engine is a search engine that sends user requests to several other search engines and/or databases and aggregates the results into a single list or displays them according to their source. Metasearch engines enable users to enter search criteria once and access several search engines simultaneously.
Essentially, a search engine for search engines ( source: Wikipedia )
Meta-Search Engines for SERIOUS Deep Digging: Surfwax Metasearch Engine
A better than average set of search engines. Can mix with educational, US Govt tools, and news sources, or many other categories. Accepts " ", +/- . Default is AND between words. I recommend fairly simple searches, allowing SurfWax's SiteSnaps and other features to help you dig deeply into results. Click on source link to view complete search results there. Click on to view helpful "SiteSnap™" extracted from most sites in frame on right.
Several blog search engines are used to search blog contents (also known as the blogosphere ), such as Bloglines , BlogScope , and Technorati . Technorati, which is among the most popular blog search engines, provides current information on both popular searches and tags used to categorize blog postings. Research community is working on going beyond simple keyword search, by inventing news ways to navigate through huge amounts of information present in the blogosphere , as demonstrated by projects like BlogScope
Technorati: Blog Search Engine http://technorati.com/
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Many sites such as portals and news providers such as Yahoo.com allow users to set preferences, for example selecting which categories of news they would like to appear on their homepage. These preferences are 'remembered' by means of a cookie.
Cookies are used to remember log-in names and passwords, so that users do not need to re-register every time they visit a site.
Many shopping sites such as Amazon.com allow users to create a "shopping cart" of items they wish to purchase. The computer remembers your purchase list by means of a cookie placed on your computer.