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Meta description is an HTML attribute that provides a brief summary usually containing between 160 and 320 characters describing a web page. Search engines like Google will display the meta description in search results. This in turn can influence click-through rates.
Formating meta descriptions
The description for the page should be a natural read and make sense using keywords on the page.
Best Practices for meta description length
Meta descriptions can be of any size, however search engines like Google tend to shorten the description anywhere from to snippets to 160 to 320 characters. Best practice is to keep meta descriptions long enough descriptive. Of course the description length will vary depending on the web page content.
Websites that do not use meta tags are missing out on a opportunity to rank higher in search results.