Use or Not to Use Meta Tag Keywords

A question came up to me if using meta keywords tag can boost or SEO ranking but first of all let us first define Meta Keywords Tag. The meta keywords tag is one of several of meta tags that you can insert into your web pages to provide search engines with information about your pages that isn’t visible on the page itself. It is usually placed within the header area of web pages.

Now going back to the question of using Meta Tag Keyword. I read a lot of articles saying the meta tag keyword is not that relevant nowadays and it's practically useless. But some says other search engine use if for retrieval purposes. So, what it's gonna be use meta tag keywords or not?

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