The snippet is a single search result in a set of search results and generally consists of a title, a URL and a description of the page. The content of a snippet matches parts of the search query and you’ll see your keyword highlighted in the snippet description. Search engines often use pieces of your content to fill in the parts that make up the snippet. In most cases, search engines determine the best possible snippet for you, but you can try to override that by adding a meta description to your page. In this post, we’ll dive deeper into what is a snippet.
>> Read : SEO basics: What is a snippet?
Source : Yoast