Amazon EC2
Hibernation:
You are not charged for Hibernated Instance usage. you pay only for the EBS volumes and Elastic IP Addresses attached to it. there are no other hourly charges (just like any other stopped instance)
To preserve contents of the instance's memory whenever the instance is unavailable.
The EBS root volume is restored to its previous state
The RAM contents are reloaded
Spot Instances
cost-effective choice if,
your applications can be interrupted
Ex: data analysis, batch jobs, background processing
Placement groups
There is no charge for creating a placement group.
Cluster
Packs instances close together inside an Availability Zone
low-latency and high network performance necessary for tightly-coupled node-to-node communication
High Performance Computing HPC applications
Partition
Groups of instances in one partition do not share the underlying hardware with groups of instances in different partitions
used by large distributed and replicated workloads, such as Hadoop, Cassandra, and Kafka.
Spread
Strictly places a small group of instances across distinct underlying hardware to reduce correlated failures