It's just code generated by your HTML editor.
What you need to concern yourself most with is the title tag and body text. These are two areas a search engine spider will always index and place considerable emphasis on.
Meta tags are secondary text. Some search engines and directories do not even consider these tags.
The meta description tag is important in respect that the engines who index this tag use this tag when displaying search results. The description can be far more important than a keyword list when it comes to visibility. The keywords that appear inside this tag should also appear in the body.
meta name="robots" content="ALL"
meta name="revisit-after" content="15 Days"
(useless tags)
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