Activity 4. http://bit.ly/qCqsU9

1. What are the advantage and disadvantage of using search engine?

The indexes of search engines are usually vast, representing significant portions of the Internet, offering a wide variety and quantity of information resources.Search engines provide some popular ways of finding information on the Internet. There is a wide variety of search engines and features. Some search engines are on specific websites, allowing visitors to the site to search for specific words or phrases.

2. Compare and contrast individual search engines and search meta search engines?


The search engines give you some control over which search queries trigger your PPC ads. Google and MSN offer three options: Exact, Phrase and Broad Match. In general, Exact Match means your ad will only appear if a person's search query matches exactly with the keyword (or phrase) you bid on. With Phrase Match, your ad is eligible to be shown if the search query contains all the words in your keyword plus additional words before and/or after.

A metasearch engine is a search tool[1] 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.

The term "meta search" is frequently used to classify a set of commercial search engines, see the list of search engines, but is also used to describe the paradigm of searching multiple data sources in real time. The National Information Standards Organization (NISO) uses the terms Federated Search and Meta search interchangeably to describe this web search paradigm.

3. When it is appropriate to use search engines whet it is appropriate to use search engines subject directory?

There are many search engines and internet directories, but familiarizing yourself with several major ones will be enough to get your online research off to a good start. The main search engines included in this article are InfoSeek, Yahoo, Excite, HotBot, AltaVista, Lycos and LookSmart; LookSmart and Yahoo are actually large directories rather than true search engines.

4. What is an invisible web or deep web?

Deep Web (also called Deepnet, the invisible Web, DarkNet, Undernet, or the hidden Web) refers to World Wide Web content that is not part of the Surface Web, which is indexed by standard search engines.

Mike Bergman, credited with coining the phrase,[1] has said that searching on the Internet today can be compared to dragging a net across the surface of the ocean: a great deal may be caught in the net, but there is a wealth of information that is deep and therefore missed.

5. How do you find an invisible web?

The Deep Web is a mammoth resource that is mostly untapped. Learn how to discover Deep Web resources with this comprehensive, ultimate guide to searching the Deep Web's goldmine of information. The Hidden Web, aka the Deep Web, aka the Invisible Web, is the part of the Web that can't be easily accessed with a simple search engine query. Learn more about the Invisible Web and how big this part of the Web is estimated to be.

6. Why are this web pages not available in search engines or subject directories?

The first two reasons (deep and big) are easy to change from the perspective of search engines. Many today go deeper into the directory structure and farther down the page than they used to. Pages without links are often of poor quality (hence no links), and so this is not a significant problem. They can still be included in most search engines by submitting the page. The next two reasons (robots excluded and protected) are not “problems”; if people don’t want others on their website, then search engines shouldn’t be going there. The last two reasons (non-HTML and dynamic) constitute what most people consider to be the invisible web, and more recently, exclusively the last reason. There are many pages on the web which are not in HTML. See Search by File Format for more on that. Google includes more non-HTML content than any other engine. There are millions of dynamic pages, many of which are exactly what you may be looking for, and many others of which are an infinite number of near-duplicate pages. Indexing dynamic pages has the potential to stall a search engine’s crawler, which is why most don’t do this. It is believed that Google index dynamic pages that it finds by following links from static ones, but does not follow links from dynamic pages themselves.


REFERENCE;
Google.com.ph
ask.com
fagafinder.com