Meta descriptions are short paragraphs that appear beneath the page title in Google. Although search engines don’t consider these when determining page relevance, it is an essential way of telling customers why they should visit your website. After the title, it is the most likely thing your user will look at.
To avoid a situation where the search engine will use a less relevant piece of text when serving up your page, you need to write these yourself. Meta descriptions should not contain over 160 characters and should naturally incorporate the focus keyword.
Note: this is NOT considered an seo tactic but is to capture the user when they see your listing in google. With a great Meta Description along with your Title you will have a greater chance of click through