SEO - Page description meta tag

Your Page Description is the first impression that Internet Searchers get after reading your Page Title on the search engine's results page. Many of these Web searchers will decide whether or not to click to your site based on your page description. Most search engines, use the Meta Description tag for the Web page's description.

The Meta Description tag is also used for indexing your site with almost all major search engines.
For these reasons, make sure that your Meta Description tag is descriptive, unique, clear, concise and contains keywords that people use when they are searching for your site. Do not use for example, "This is Company ABC's Home Page". This is neither descriptive nor unique. Also, use different descriptions for different pages. This will allow your results to be unique in the results page if multiple pages from your site are displayed together.

Read :
SEO-Title of your Web page