1The Elasticity Promise
The 'Elastic' in EC2 refers to the ability to quickly scale capacity up or down as your computing requirements change. Instead of waiting weeks or months to provision physical servers, you can launch thousands of EC2 instances in minutes.
2The Financial Shift
EC2 represents a shift from Capital Expenditure (CapEx - buying servers) to Operational Expenditure (OpEx - paying per second/hour). You only pay for what you use, when the instance is running.
