The robots meta tag allows robots to be directed to certain directives such as indexing the page viewed, tracking found links, caching and many other topics.
Example of setting up a robots meta tag in the <head> of an HTML page
<Html><Head><title> Page Title </ title><meta name = "robots" content = "noindex, nofollow"></ Head>By default
Do not use this tag unless it is directed by your SEO team. If the crawlers find no such directive on the requested page, they will understand that they can index it, cache it, follow the links found - in short, explore it freely.
It is therefore not necessary to add in your source code the following statement which is the default behavior of the engines:
<Html><Head><title> Page Title </ title><meta name = "robots" content = "index, follow"></ Head>Possible guidelines
For information, here are the possible directives:
<meta name = "robots" content = "noindex">: prevents crawlers like Google from indexing the page<meta name = "robots" content = "nofollow">: prevents crawlers like Google from following links from page viewed<meta name = "robots" content = "noarchive">: prevents crawlers like Google from caching your page<meta name = "robots" content = "nosnippet">: prevents display of the meta-description in search results<meta name = "robots" content = "noodp">: Prevents the use of a replacement description from DMOZ directories.<meta name = "robots" content = "unavailable_after: [date]">: Deindexes a page after the specified date and time (in RFC 850 format)There are many others but use these tags only when requested by your SEO team. The main directives that you may be asked for are noindex, nofollow or in rarer cases unavailable_after.