Activity 4

What are the advantages and disadvantages of using search engines?
The advantage of using search engine, is that it has most of the information you can search for in the internet, and with absence of book it is a great help to get information.

The disadvantage is that you are not sure if the information is accurate and you have to gamble for it. Ans. Compare and contrast individual search engines and search meta search engines.
In individual the information is stored within the site then the meta use multiple search engine in the net.

When is it appropriate to use a search engine? Ans. When looking for information on the internet, and if the information is reliable and accurate by following the reference or if has a author. If you can't find it the book or in the library you have to used the internet.
When is it appropriate to use a search/subject directory? Ans. When you search for a specific information in the internet.

•What is an Invisible Web or ‗Deep Web‘? Ans. There are parts of the Internet that search engines simply can't see. The search engine's robotic "crawlers" either miss or are locked out of these areas on the Internet. Behind the barriers lie treasure troves of quality information. Collectively this information is called the Invisible Web. There are many categories of invisible information missed by the popular search engines.

•How do you find an Invisible Web? Ans. One trick for finding databases with standard search engines is as simple as adding the term “database” to your search query. Instead of “Buddhism,” try “Buddhism database.” By doing this, you are using the search engine to find a gateway to more information, rather than the information itself.

•Why are these web pages not available in search engines or subject directories? Ans. Webpages that have been intentionally skipped by search engine crawlers. Webpages that are dynamically assembled from online database content. Password protected webpages. Non-HTML resources like image, audio, animation, and PDF files