EC2 Savings generally refers to the savings achieved by using Reserved Instances (RIs) and Savings Plans (SPs) compared to paying for the same EC2 usage at the On-Demand rate.
Spot savings is not typically included under the "EC2 Savings" category.
Spot Instances are a separate pricing model offered by AWS that allows users to bid on unused EC2 capacity at a lower price. The savings achieved through Spot Instances are not typically included in the calculation of EC2 Savings, as that category focuses on RIs and SPs specifically.