EC2 instances- Elastic Compute Cloud, this is essentially a virtual machine
In a typical data center, you use a hypervisor like vmware to create virutal machines on top of a physical server and you have a level of liberty to choose your own configuration like vCPU (virtual CPU) and RAM, in cloud , like AWS, its all pre configured! and there comes the AWS Instance families
Instance families :
fixed vs burstable:
Cx,Rx, Mx are fixed, static unit based ec2
Tx - CPU burstable - governed by CPU Credits. ex t3 nano has 2vpu and 6 cpu units burstable
Once you spin up server using any of those, it will be in any one of the below states
![credit aws](https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdocs.aws.amazon.com%2FAWSEC2%2Flatest%2FUserGuide%2Fimages%2Finstance_lifecycle.png)
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