be2f37df_er_Checklist___SearchTools_com__Action
[Content] Keywords [Action] 
Page creators can add keywords to their pages to describe them more clearly, and these should be indexed together with the text of the page. For example, a page on cats and dogs as pets might have the following keywords: Some keywords are delimited by spaces, some by commas, and some by both, and extra white space should be ignored. Where the creator has added commas, I recommend that you treat the contents as phrases. You should also use this information to help weight the page in the results rankings, but beware of keyword spamming (adding many repetitions of a word).
Indexing Robot Crawler Checklist - SearchTools.com
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