Why Meta Description Is Necessary ?

Meta descriptions are HTML and XHTML attributes that provide brief explanations of your page on search engine. Meta descriptions are commonly used on search engine result pages to display preview a small piece for a given page. While the perceived (and real) importance of Meta data has under value, Meta is still important for SEO ranking. Meta description means, how to view your site's Meta description, and what impacts on visitors. These short paragraphs that describe the content what the searcher want to view their search result page. Every website has unique Meta description if it match to any other page description it should be rejected. The description is must be between 150-160 words.

Meta description is important in SEO optimizing? 
Meta description is your best part of web site that attracts a searcher to come to your site. But you don't make an effective description you lost a good traffic, so that is bad impact on website. If Meta description is not matter in improve the ranking of your website then what you waste your time to make it effective?
if you leave a meta description blank then Google want to pulled your content that display in your snippet, you do not able to display your message about your website to the potential visitors, Then it bad impact on your website ranking so Meta description is important in web site ranking. You have 160 words to write an effective Meta description to get this great opportunity to tell about your pages to your possible visitors.

Best guidelines for writing Meta descriptions.

• The description is must be between 150-160 words
• Every page must have unique Meta description
• Create unique Meta description it may be time consuming for large web site
• Target a unique keyword for each webpage
• The Meta description does not have a full page description