Meta tags are HTML elements used to provide structured metadata about a web page. Such elements are placed as tags in the
section of an HTML document.
Contents [hide]
1 Meta tag structure
2 Search engine optimization
3 Redirects
4 HTTP message headers
5 Alternative to meta tags
6 External links
Meta tag structure
%i18n; -- lang, dir, for use with content --
http-equiv NAME #IMPLIED -- HTTP response header name --
name NAME #IMPLIED -- metainformation name --
content CDATA #REQUIRED -- associated information --
scheme CDATA #IMPLIED -- select form of content --
>
Search engine optimization
The two most common uses of meta tags on the Web are to provide a description and to provide meta keywords for a web page. This data may then be used by search engines (such as Google) to generate and display a list of search results matching a given query.
Meta tags such as these have been the focus of a field of marketing research known as search engine optimization (SEO). In the mid to late 1990s, search engines were reliant on meta tag data to correctly classify a web page. Webmasters quickly learned the commercial significance of having the right meta tag, as it frequently led to a high ranking in the search engines - and thus, high traffic to the web site.
As search engine traffic achieved greater significance in online marketing plans, consultants were brought in who were well versed in how search engines perceive a web site. These consultants used a variety of techniques (legitimate and otherwise) to improve ranking for their clients.
In the early 2000s, search engines have veered away from reliance on meta tags since many web sites used inappropriate meta keywords or a technique known as keyword stuffing, in order to increase their search engine ranking. Some search engines still take meta tags into consideration when delivering results, though most of the major search engines ignore them. Currently, Google does not use meta tags to index web sites, however Google will sometimes use text from the meta description in search results pages as the snippet of text that it displays, if terms queried appear in that description.
Techniques have also been developed in order to penalize web sites considered to be "cheating the system". For example, a web site repeating the same meta keyword several times may have its ranking decreased by a search engine trying to eliminate this practice, though that is unlikely. It's more likely that a search engine will ignore the meta keyword tag completely, and most do regardless of how many words used in the tag.
Redirects
It has been suggested that Meta refresh be merged into this article or section.
Meta refresh tags can be used to instruct a web browser to automatically refresh a web page after a given time interval. It is also possible to specify an alternative URL and use this technique in order to redirect the user to a different location. Web designers using a meta refresh in this way and solely by itself, is not always going to work. For Internet Explorer's security settings, under the miscellaneous category, meta refresh can be turned off by the user, therby disabling it's redirect ability entirely.
HTTP message headers
Meta tags of the form
can be used to send http headers. For example,
would tell a browser (or other http client) that the page "expires" on June 21, 2006 and that it may safely cache the page until then.
Alternative to meta tags
An alternative to meta tags for enhanced subject access within a web site is the use of a back-of-book-style index for the web site. See examples at the web sites of the Australian Society of Indexers www.aussi.org and the American Society of Indexers
In 1994, ALIWEB, which was likely the first web search engine, also used an index file to provide the type of information commonly found in meta keywords tags
http://en.wikipedia.org/wiki/Meta_tags
Hope this helps you out
Good luck.
2006-07-05 22:53:34
·
answer #1
·
answered by Eternity 6
·
3⤊
0⤋
