What is block storage?

The storage that is not on your physical machine but is accessed as a local storage device by the server is known as Block Storage. Block Storage is a type of data storage typically used in storage-area network (SAN) environments where data is stored in volumes, also referred to as blocks.

A data storage device pool is there at a centralized location like a Data center or a large galaxy of hard drives coupled at a remote location and is accessed by one ,giving a IaaS platform.