What is the full form of SSD and HDD ?

SSD -Solid state drive
HDD - Hard disk drive

what are the two types of SSD?

SATA SSD
NVMe SSD

When can we use Cold HDD ?

Cold HDD: Used for storing rarely accessed (inactive) data, such as backups, and long-term storage.

Define IOPS and Throughput.

IOPS: Number of input/output operations a storage device performs per second.

Throughput: Amount of data transferred by a storage device per second (measured in MB/s or GB/s).

What does IOPS stand for?

Input Output operations per second