Need Expert help

I recenly subscribed for adsense for my website , when i log
in to my
google account i see the following

 Page impressions  Clicks  Page CTR  Page eCPM [?]  Earnings
AdSense for content  11  2  18.18%  $0.00  $0.00

I don't understand the followind
1)Page impressions
2)clicks
3)Page CTR
4)Page eCPM 

Can any one explain 

Thanks


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