Search engines use crawlers to gather documents from across the web. Indexing software receives these documents and extracts key information to build searchable indexes. When a user searches for terms, the search engine uses its indexes to return relevant results, often displaying the title and excerpt of documents for the user to select and access directly from the source site.

1. How Internet Search Engines Work
s1160247 Takahumi Wada
s1160248 Yuhei Wada
s1120244 Ryo Watanabe

2. Search Engines
● Each search engine
uses a crawler or
spider with its own set
of rules guiding how
documents are
gathered

3. Software does as a spider
● Software agents are
instructed to get the
URLs and documents
as the spider
discovers them and
send information
about them to
software.

4. The indexing software
The indexing software receives the documents
and URLs from the agent.
Each search engine extracts and indexes different
types of information.
The kind of index built determines what type of
searching can be done with the search engine and
how the information will be displayed.

5. Search the internet for information
When you visit a search engine and want to
search the Internet for information, you type words
on a web page that describe the information you
want to find.
For example, you can search by date and other
criteria with some search engine.

6. How show the results
Each search engine return the results in a different
way.
For example, some show the URL, as well as the
first several sentences of the document. And some
show the title of the document and the URL.

7. After you find that you want to find
When you click a link to one of the documents that
interests you, you are straight to the document.
The document itself is not in the database or on
the search engine site.