Alexa.com place to know raning of each & every site . Few year back people have not any idea of ranking of others site
but when
advertiser enter in the internet market then every advertiser want to know the ranking of that where he advertise than after necessity of Raning site exist & Alexa.com is best place for this .
You can also embeded the ranking from here to your site .Now at Alexa.com you can watch the line graph of your previous performance & traffic from various country .