Current search engine main retrieval service

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At present, some of the main search engines provide search services are:

1 directory and Keyword search combined (browsing & searching Integration)

The typical representative of this type of retrieval tool is Sohu (http://www.sohu.com).

2) Accurate search (Precise search)

There are two methods for accurate retrieval, one is using a controlled thesaurus and the other is using XML technology.

3 Natural Language Search (Natural Language search)

The representative of natural language retrieval has ask Jeeves, GoTo, Inquizit and Lexiquest. When using this retrieval tool, the user can propose the same as "What is Jamestown", "When did Web searching start?" And so on.

4 Multilingual Search (Multilingual)

Users can limit the search results to the language in which the results are retrieved. This retrieval service is provided in AltaVista, HotBot, Excite, Infoseek/go. Infoseek/go also provides automated translation services for retrieval results.

5 Multimedia Search (multimedia search)

Multimedia retrieval includes multimedia retrieval based on description and content-based multimedia retrieval. Based on descriptive multimedia retrieval is to use a keyword to describe the image or music to look for, such as the word "classroom" to find the classroom picture, or the word "spring" in the Lycos MP3 search engine to find related music. content-based multimedia retrieval is to use some visual features to find multimedia information, which includes color, shape, texture and so on.

6 Filter Search (filtered search)

In the retrieval of some Web site information automatically filtered out, such as some unhealthy information on the yellow site, the impact of national security of the political reactionary website information, such as the search service technology by parents welcome, can avoid children when the Internet is not affected by health.

7) Intelligent Search (Intelligent search)

The meaning of intelligent retrieval is that the retrieval system can automatically analyze the retrieval results and provide the most satisfactory information to the users.

8) Search Result correction (search midification)

The revision of the retrieval result is to adjust the retrieval scheme in the range of the last retrieval result, in order to achieve more accurate information.

9 Search Result Ordering (New ranking/selection techniques)

Search engines automatically analyze the pages that are queried, and the most relevant pages are ranked in front of them based on the dependency algorithm.

10 to provide the latest collection of new stations (Sites for staying the current on Web Search Tools)

Most search engines have new announcements to announce to users which websites the search engine collects.