website’s 'snippet'

Description is sometimes used by search engines as a website’s 'snippet' for search results.

What does the above statement (website’s 'snippet') mean?

Please advise.

Whenever you search for something using a SE (like Google for instance), the results are as follows:

Very nice title phrase to get people to click
This is a bit of an explanation of the page, also called a "snippet"... SEs sometimes use the description meta tag for this ... usually spans two lines
http://www.example.com/somepage.htm

The middle (black text) bit is the "snippet", literally snipped from the page's content or description meta.