Can some one explain Operations and Usages within Amazon AWS services?

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http://serverfault.com – Can any one please explain in layman terms the meanings of EBS IO read, EBS IO write, Public IO In, Public IO Out, CreateVolume etc, These are operations for ec2 services. But then, I need something for all services? or Can some one point me in right direction? Followup question: These operations and usages impact the costs on the AWS services. Do they also map directly to CPU utilization, Memory Utilization Disk IO read, SWAP Memory and so on? (HowTos)