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AWS lets you rent a computer by the second — and it changed everything
💡 EC2 lets you rent virtual servers by the second, so you only pay for the compute power you actually use.
Before the cloud, launching a new app meant buying physical servers, racking them in a data center, and waiting weeks for delivery. Amazon EC2 (Elastic Compute Cloud) flipped that model entirely — you can now spin up a virtual server in under a minute and pay only for the seconds you use it.
An EC2 instance is essentially a virtual computer running in Amazon's data center. You pick the operating system (Linux, Windows), choose how powerful it should be (CPU, memory, storage), and launch it. Need a tiny server for a personal blog? Pick a t3.micro. Need a beast with 96 CPUs for machine learning? There's an instance type for that too. The key idea is elasticity — you can scale up when traffic spikes and scale back down when it's quiet, so you never pay for idle hardware.
EC2 was one of the very first AWS services, launching back in 2006. It's often called the backbone of the cloud because nearly every other AWS service was built around the idea that compute power should be on-demand, not pre-purchased. Even today, with newer options like serverless and containers, EC2 remains the most widely used compute service in the world.