An Amazon EC2 Dedicated Host is a physical server with EC2 instance capacity fully
dedicated to your use. Dedicated Hosts allow you to use your existing per-socket,
per-core, or per-VM software licenses, including Windows Server, Microsoft SQL Server,
SUSE, Linux Enterprise Server, and so on
Dedicated Instances are Amazon EC2 instances that run in a VPC on hardware that's
dedicated to a single customer. Bring your own licensing (BYOL) is not supported for
dedicated instances
Spot instances allow you to bid in the marketplace for EC2 instances to reduce cost,
they do not allow BYOL
Reserved instances allow you to reduce on-demand price by up to 70% by committing to a
1- or 3-year term