IOPS:
Represents the number of read and write operations a storage device can perform in a second, which is an indicator of the speed of individual operations.
You have the flexibility to adjust the IOPS (Input/Output Operations Per Second) of your storage volume (that will be attached to your EC2) while creating the EC2 instance.
Throughput:
Throughput measures the amount of data that can be transferred to and from the storage device in a given time frame. It's typically measured in megabytes per second (MB/s) or gigabytes per second (GB/s) and is vital for activities like data migration or streaming.
To get a holistic understanding of storage performance, both IOPS and throughput should be considered. Make changes to IOPS and Throughput tailored to your instance needs.
Encryption:
A best practice is to enable encryption for your volume. You can either choose the default AWS KMS (Key Management Service) key or create a custom KMS key for encryption.