EC2 is an infrastructure as a service (IaaS) cloud.

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EC2 is an infrastructure as a service (IaaS) cloud. This means that Amazon EC2 provides the hardware, while the user is responsible for running the software. EC2 offers the following: 
CPU, RAM, Storage, Scalability, Flexibility, Raw compute power. 
Some types of EC2 instances include: 
General Purpose Instances
Compute Optimized Instances
Memory-Optimized Instances
Accelerated Computing Instances
Storage Optimized Instances

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