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Meta keywords have historically been used by browsers to categorize content on your page. Restrict the number of keywords to less than 20 as crawlers only account for a limited number.
The meta description is often used by search engines to display summary text to the user in search results. Within a search results page, this text often appears beneath your title text and should be succinctly descriptive of your page's content.
Good meta descriptions encourage users to visit your page over your competition.