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Blown to Bits Ch.,. questions and answers verified 2024
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Blown to Bits Ch.,. questions and answers verified 2024
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Blown to Bits Ch. 4How do search engines work? - correct answer ✔1. Gather information. Jen
explores the Web, visiting many sites on a regular basis to learn what they
contain. Jen revisits old pages because their contents may have changed,
and they may contain links to new pages that have never been visited.
*spider*
2. Keep copies. Jen retains copies of many of the web pages she visits. Jen
actually has a duplicate copy of a large part of the Web stored on her
computers. *caches*
3. Build an index. Jen constructs a huge index that shows, at a mini- mum,
which words appear on which web pages.
When you make a query, Jen goes through four more steps, in the
foreground:
4. Understand the query. English has lots of ambiguities. A query like "red sox
pitchers" is fairly challenging if you haven't grown up with baseball!
5. Determine the relevance of each possible result to the query. Does the web
page contain information the query asks about? *relevance>recall*
6. Determine the ranking of the relevant results. Of all the relevant answers,
which are the "best"?
7. Present the results. The results need not only to be "good"; they have to be
shown to you in a form you find useful, and perhaps also in a form that serves
some of Jen's other purposes—selling more advertis- ing, for example.
Search - correct answer ✔New form of control over information
Organic Search Results - correct answer ✔*Appear due to their relevance to
the search terms* ordinary links that Web information retrieval algorithms
decided were most relevant to a users search
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