The meta description is the short explanation of the contents of a web page that the search engines include on results pages. While the meta description does little to directly impact search engine optimization, it does wonders for improving click-through rates. Which, of course, will then improve your ranking.
In some platforms, the meta description is automatically generated based on the first 150 to 160 characters of the page copy. In others, the developer creates the description or has the opportunity to modify it. Either way, there are certain guidelines that will help you make the most of your meta description.