What is eCPM

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Hello people! Wonders! I check my adsense and earned $0.28!! haha not bad for starters, I've been blogging for ony 5 days today to be exact. But what is ecpm? Yeah, I read about it by clicking the question mark beside the word, but how come it varries in value with my earning? I will only be paid for my earnings, right? and not the ecpm right? What is the value of the ecpm for? Please enlighten me, anyone. Thanks so much!!!:-) I will really appreciate any help...