EC2

The foundational service that provides compute resources for customers to build their applications on AWS is called Amazon EC2. Amazon EC2 provides customers with a choice of 500+ instance types. Customers can then tailor the right combination of instance types for their business applications.

Amazon EC2 provides five types of instances:

General purpose instances
Compute optimized instances
Accelerated computing instances
Memory optimized instances
Storage optimized instances

Each of the instance types listed here is actually a family of instances, as shown in figure below: