A content snippet refers to the content returned on a Search Engine Results Page (SERP) which when clicked on, links through to a piece of content on a website.
A content snippet always includes at least three elements – a page title, url and meta description – and sometimes includes others, such as site links and rich snippets.
A website owner can write a page title and meta description for each piece of content on their site – and have up to 65 and 165 characters for each respectively (assuming they want them delivered in their entirety on the SERPs). The assigned meta description is not always returned in the content snippet sadly. This is at the search engines discretion.
Website owners can also influence what the url – or slug – is for each piece of content.
In certain instances, site links are shown on the SERP which the search engine deem to be the more important pages on a website.
You’ll sometimes see rich snippets included as part of the content snippet. These sometimes appear for products or services, in the form of star ratings, assuming ratings have been given and structured data has been included on the product or services pages.