A meta description is the description of the content of your website or web page. It informs the Internet user about what he will find by clicking on your site. It is located below the title link that allows the access to your site in the pages of search engines.
The meta tag "description" plays an essential role in the referencing of a website because it appears in the SERPs of search engines. Even if it is no longer crawled by search engine robots, it is the main showcase of your website (along with the title). Having a nice showcase attracts more traffic and increases your CTR, improving your SEO. Its goal is therefore to attract the interest of Internet users to visit your site.
When you write your title in your meta tag "description", it is important to respect several criteria in order to optimize it :