How meta robots tag uses and their benifits are?

Robots Meta Tag give the instruction to search engine that how  crawl and index the website.


There are different value of Robots Meta Tag, read them below.

Scroll down for an overview of which search engines support which specific parameters.

index

Allow search engines to add the page to their index, so that it can be discovered by people searching.

Note: This is assumed by default on all pages – you generally don’t need to add this parameter.

noindex

Disallow search engines from adding this page to their index, and therefore disallow them from showing it in their results.

Note: Informal messaging from Google suggests that, if a page is set to noindex for a long period of time, it may also be treated as if it were also set to nofollow. The precise mechanics of this are unclear, and it’s unclear whether other search engines behave similarly.

follow

Tells the search engines that it may follow links on the page, to discover other pages.

Note: This is assumed by default on all pages – you generally don’t need to add this parameter.

nofollow

Tells the search engines robots to not follow any links on the page.

Note: It’s unclear whether this attribute prevents search engines from followinglinks, or just prevents them from assigning any value to those links.

Note: It’s also unclear (and inconsistent between search engines) whether this applies to all links, or only internal links.

none

A shortcut for noindex, nofollow.

all

A shortcut for index, follow.

Note: This is assumed by default on all pages, and does nothing if specified.

noimageindex

Disallow search engines from indexing images on the page.

Note: If images are linked to directly from elsewhere, search engines can still index them, so using an X-Robots-Tag HTTP header is generally a better idea.

noarchive

Prevents the search engines from showing a cached copy of this page in their search results listings.

nocache

Same as noarchive, but only used by MSN/Live.

nosnippet

Prevents the search engines from showing a text or video snippet (i.e., a meta description) of this page in the search results, and prevents them from showing a cached copy of this page in their search results listings.

Note: Snippets may still show an image thumbnail, unless noimageindex is also used.

notranslate

Prevents search engines from showing translations of the page in their search results.

Unavailable_after

Tells search engines a date/time after which they should not show it in search results; a ‘timed’ version of noindex.

Note: Must be in RFC850 format (e.g., Monday, 15-Aug-05 15:52:01 UTC).

noyaca

Prevents the search results snippet from using the page description from the Yandex Directory.

Note: Only supported by Yandex.

noydir

Blocks Yahoo from using the description for this page in the Yahoo directory as the snippet for your page in the search results.

Note: Since Yahoo closed its directory this tag is deprecated, but you might come across it once in awhile.

An example of a meta robots tag code would look like this:

<meta name =”robots” content=”index”>

What this tag does is to index the webpage which it is on. It’s like telling someone who’s going to get a glass of water to get a glass of water. Because again, by default, search engine already indexes your site even if you don’t use this code.

And you can also combine the commands if you so desire:

<meta name=”robots” content=”noindex,nofollow”>

For me, this code is a good thing to keep in mind – especially if you’re trying to save up Google juice by applying nofollow to your outbound links. Other than that, it’s not something you’d want to keep on checking when you’re optimizing your on-site SEO.

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