'Amazon' owned search service which measures website traffic.
Alexa is heavily biased toward sites that focus on marketing and webmaster communities. While not being highly accurate it is free.
I was told a while ago by some not to be too concerned with alexa rankings. For instance, there are some sites that get tons of visitors without even being aware of what their rankings are and so forth.
Alexa is a company that measures web traffic on almost every website on the internet through their increasingly popular toolbar plugin.
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