Search engines use web crawlers or spiders to systematically browse websites and index their content. As spiders discover new pages and URLs, the page content is scanned and indexed for fast retrieval. When a user searches, the search engine accesses this index of keywords and returns results rapidly by matching search terms to indexed page content. Major search engines like Google, Yahoo and Bing each have their own proprietary systems for web crawling, indexing and retrieving search results.

1. How Internet Search Engines Work
● The search Robot
● Method of retrieved
● Search Engine
● Spider

2. The Search Robot
● Web crawler, or “spider”
– A program which browses
the Web in a methodical,
automated manner and is
used to create of all the
visited pages for later
indexing by a search
engine

3. Spider
● Internet search the
URLs as the spider
discovers document
and URLs.
● Reference: Wikipedia

4. Method of retrieval
● The document group that retrieves it beforehand is scanned,
and the method for improving the performance when retrieving
it by preparing the index data that a high-speed retrieval
becomes possible is adopted. When retrieving it, a high-speed
in dramatic form retrieval becomes possible because it
accesses this index.

5. Search Engine
➢ There are lots of information on the WWW, and
you can get that to use Search Engine. Web
pages, images and...
➢ Search Engine, for example:
Google, Yahoo, Msn, and so on.
Their Engine return results in a different way.

6. REFERENCE
● Medicated development
– http://www.madicted.net/web-glossary/term/w
● Wikipedia
– http://ja.wikipedia.org/wiki/%E3%83%A1%E3
● Google(image)
– http://images.google.co.jp/imghp?hl=ja&tab=