Meta Tags, Meta Robots, Meta Description

Meta Tags

Dear viewers,Meta tags were originally intended to provide a proxy for informatin about a website content. Several of the basic meta tag are listed below, along with a description of their use.

Meta Robots

Dears The Meta Robots tag can be used to control search engine spider activity (for all of the major engines) on a page level. There are several ways to use meta robotes to control how serch engine treat a pages:

• index/noindex tells the engine whether the page should be crawled and kept in the engine' index for retrieval. If you opt to use "noindx", the page will be excluded from the engines. By default, search engines assume they can index all page, so using the "index" value is generally unnecessary.
  
• follow/nofollow tells the engines whether links on the page should be crawled. If you elect to employ "nofollow," the engins will disregard the links on the page both for discovery and ranking purposes. By default, all pages are assumed to have the "follow" attribute.
  Example: <META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
• no archive is used to restrict search engine from saving a cached copy of the page. By defaults, the engines will maintain visible copies of all pags they indexed, accessible to searcher through the "cached" link in the search results.
• nosnippet informs the engines that they should refrain from displaying a descriptive block of text next to the page's title and URL in the search results.
• noodp/noydir are specialized tags telling the engines not to grab a descriptive snippet about a page from the Open Directory Project (DMOZ) or the Yahoo! Directory for display in the search results.

The X-Robots-Tag HTTP header directive also accomplishes these same objectives. This technique works especially well for content within non-HTML files, like images.

Meta Description

Dears,The meta description tag exist as a short description of a page content. Search engine do not use the keyword or phrase in this tag for ranking, but meta description are the primary source for the snippet of text displayed beneath a listing in the result.
The meta description tag serves the function of advertising copy, drawings readers to your site from the results and thus, is an extremely importants part of search marketing. Crafting a readable, compelling description using important keywords (notices how Google "bold" the searched keyword in the description) can draw a much higher click-through rate of searchers to your pages.
Meta description can be any length, but search engine generally will cut snippets longer than 160 characters, so it' generally wise to stay in these limits and....
In the absences of meta descriptions\, serch engines will create the search snippt from other elements of the page. For pages that target multiple keywords and topics, this is a perfectly valid tactic.

Not as Important Meta Tags????????

Meta Keywords?????

Dears The meta keyword tag had value at one time, but is no longer valuables or importants to search engines optimizations. For more on the history and a full account of why meta keyword has fallen into disuse, read Meta Keywords Tag 101 from SearchEnginesLand.

Meta refresh, meta revisit-after, meta content type, etc.by anwar

Althoughs these tags can have uses for search engines optimizations, they are less critical to the proces, and so we'll leave it to Google's Webmasters Tool Help to answer in greater detail - Meta Tags.