Meta tags are HTML codes that are inserted into the header on a
web page, after the title tag. In the context of search engine
optimization, when people refer to meta tags, they are usually referring
to the meta description tag and the meta keywords tag.
The meta description tag and the meta keywords tag are not seen by
users. Instead, these tags main purpose is providing meta document data
to user agents, such as search engines. In addition to the well-known
meta description and meta keywords tags, there are other useful meta
tags, including the meta http-equiv tag, meta refresh tag, the meta
robots tag, the meta copyright tag, and the meta author tag, etc. These
tags are used to give web browsers and search engine spiders directions
or data on various information.
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