The Windows is a hierarchical database that stores system configuration information. It maintains files used to control the operating system’s hardware and software and keeps track of the system’s users.

Registry

Explanation:

Windows Registry is used to store the configuration and setting information for hardware and software program which is critical for Windows operation. The registries are structured in hierarchical database model.  

Basically, hierarchical database model is akin to a tree format which consist of the parent nodes and their child nodes.  For example, a node named as HKEY_LOCAL_MACHINE can possess child nodes HARDWARE, SOFTWARE AND SYSTEM.

The node in the tree is also termed as a key.

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