A meta description gives you a chance to go beyond your title tag and provide both the users and the search engines another opportunity to understand what they might find on your web page.
Not exact matches
You're also
given the ability to provide ALT tags,
meta descriptions, and title tags.
The maximum length of this
meta description is greater than it once was — now around 300 characters — suggesting it wants to
give readers more insight into what each result will
give them.
A
meta description is a block of text that search engines can see and use to describe what a
given page is about.