Meta Description

The meta description tag is typically a sentence or two of content which describes the content of the page.
A good meta description tag should:

1. be relevant and unique to the page;
2. reinforce the page title; 
3. focus on including offers and secondary keywords and phrases to help add context to the page title.

Relevant meta description tags may appear in search results as part of the page description below the page title.
The code for a meta description tag looks like this

<meta name="Description" content="Your meta description here. " / >