What is a Meta Description?
A meta description is an HTML tag used to provide a brief summary of the webpage. It is also called the SEO description.
Meta description is displayed below the title on SERP and is intended to interest the searcher to click the page. They also inform search engines about the details of your content.
How to Add a Meta Description?
Google recommends that you specify your meta description by adding a meta description tag
<meta name="description" content=" " /> to your content and additional details through structured data.
However, there is no guarantee that Google will display the meta description you specified. Google aims to display the most relevant meta description to the visitor. So, Google may extract text from your content and show it as your meta description, even if you already specified one.