Originally Posted by Addalina

How much it's important for websites?
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The Alexa traffic rank of a website compares how much traffic websites are getting on the Internet with a site ranked number 1 having the most visitors.

Thanks for sharing this nice info with us.
hoping more from u.

Alexa ranking is good for your site, this hows your link-in sites and your site traffic rank in global world.. i would like to say make concentration on Alexa rank

Its a stat site or you can say search engine. It also keep record of site data like traffic, keyowrds, top 100 links.

Alexa Internet, Inc. is a California-based subsidiary company of Amazon.com that is known for its toolbar and Web site. Once installed, the toolbar collects data on browsing behavior which is transmitted to the Web site where it is stored and analyzed and is the basis for the company's Web traffic reporting

via wikipedia

Alexa's operation includes archiving of Web pages as they are crawled. This database served as the basis for the creation of the Internet Archive accessible through the Way back Machine. Alexa continues to supply the Internet Archive with Web crawls.
this is what Aelxa is