Meta Description is the process of summarising your content for the user and search engine point of view. A meta description is between the character of 150 to 160 characters. Make sure your meta description gives the image of the remaining content. Add your keyword and power  word in the meta description and make it attractive because three things seen in SERP when you type any query first is title, URL, and meta description. 

Your CTR  can also get improve when you write an attractive meta description.