A Search Engine plays very important role on internet we can say these are the backbone of the web because if anyone need to get knowledge on some topic then he must go first a search engine then with the help of any keyword he can find the relevant information. The top search engines which have importance on the web are as follows:-
1.Google
2.MSN
3.Yahoo
4.Alexa
5.Alta Vista
6.Dmoz
7.AOL and many more
There are lots of Search Engines, but few of them are very important as listed above. The most important search engines are giant sized automated cataloguing & retrieval systems. They typically have large databases of web pages & other information found on the net. Upon specific query by the users these databases are scanned & the matching results displayed. The utility of search engines in web search lies in the fact that they are the repositories of large amounts of information which can be searched very conveniently using certain keywords.
The following are some of the activities of different search engine
Search Engine | What's not indexed | Slow Pages play a role? | Content and location | HTML Title | Meta tags | Keyword Frequency | Link popularity | What it likes | AltaVista
Search Engine | Registration pages, text in graphics and multimedia files (use Alt tags), XML, Java applets, comment tags, Acrobat files, spammers | Yes | Very important,
Top of the page | Very important, should be unique for every page | Not important, but should be included just in case | Not mentioned0, but the best location is title and top of page | Important | Uncommon words, good navigation, plain HTML pages with text only , themes, inbound links and keywords in link text. |
DMOZ
Users: AOL, Netscape; AltaVista, HotBot,
Google and Lycos directories | Spammers | Yes, considered poor design | Worthy of indexing as determined by editors, and in appropriate category | No, but the title filled in plays a role. | No, but the description and keywords filled in play a role. | No | Not important for DMOZ, but is Important, for some of its partners, who use Inktomi | Concise and accurate descriptions and keywords, choice of appropriate category |
Google
Search Engine | Not mentioned, see AltaVista for approximate guidelines; spammers | Not mentioned | Keywords should be close to each other.
Content should include keywords in text or links | Not mentioned,
but seems to be a factor | No | Not mentioned | Very important, especially from relevant pages | Link popularity, keywords near each other, keywords in URLs and link text, themes |
Yahoo
Directory | Spammers | Yes, may be excluded | Worthy of indexing as determined by editors, and in appropriate category | No, but the title filled in plays a role. It should be concise | No, but the description and keywords filled in play a role. | No | Very important, uses Google | Concise and accurate descriptions and keywords, choice of appropriate category |
MSN
Search Engine | Spammers,frames -
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tag needed</font></td>]]> | No | Not mentioned |
Important, should contain keywords | Both are supported; description limited to 250, keywords to 1017 |
Important, 4-12 times |
Important, uses Inktomi | Theme present throughout the site, site popularity |
Search Engine | What's not indexed | Slow Pages play a role? | Content and location | HTML Title | Meta tags | Keyword Frequency | Link popularity | What it likes |
