Page views: how many times the page or pages containing your AdSense advertisement was shown to readers or visitors.
What might causes page impressions and page views becomes different:
Clicks: how many times your AdSense link is being clicked.
What is Page CTR?
Page CTR: CTR (Click Through Rate), is the number of times an advertisement is clicked divided by tthe number of impressions for the page containing the ads. In other words, it is the percentage of the clicks received, based on how many views it has. CTR = number of clicks / number of exposures.
What is eCPM?
Page eCPM: eCPM stands for ‘effective cost-per-thousand, (M= mil, it’s Latin )’ it is calculated by dividing the total earnings by total number of impressions in thousands. (Total earnings / Impressions) X 1000 = eCPM.