Meta Keywords Black Hat SEO Technique:

Meta Keywords should be a short list of words that inform of the main focus of the page. Meta keywords have been so misused in the past that there are few if any search engines that take any heed of them.
Here’s an example of the meta keywords being used in the correct manner,

<meta name=”Keywords” content=”Online marketing, digital marketing, search marketing, search engine marketing, e-mail marketing, SEO” />