Compute optimized & Memory optimized instances

Though I initially came across only these two terms, when exploring found that these are just two of the six different family of instances offered by Amazon EC2. 

The other four are

1. General purpose
2. Storage optimized
3. Micro instances &
4. GPU instances

Let me keep the focus on Compute optimized & memory optimized instances in this writing

Compute optimized instances are instances that are suited for running CPU intensive applications (heavy traffic webservers, batch processing, compute intensive engineering applications, etc.). They have higher vCPU to memory ratio and are offered at the lowest cost per vCPU

Memory optimized instances on the other hand are best suited for memory intensive applications (high performance in-memory databases, in-memory analytics applications, etc.). These instances are offered at lowest cost per GB of RAM compared to its peers

--------------------------------------------------------------------------------------------------------------------------