Hierarchy:

     Hierarchy is an arrangement of items in which the items are represented as being "above", "below", or "at the same level as " one another.

The general diagram of hierarchy:

• A hierarchy is a top down approach. The item which is placed at top will have higher authority on hole team e.g CEO.

Hierarchy of an Organization:

• Hierarchy defines clear cut authority for work. 
• Clear communication.
• Establishes a communication between manager and Subordinates.

Memory hierarchy:

• CPU Logic is usually faster than main memory access time.
• The cache memory is faster then main memory.
• Cache memory is used for storing data of currently executing programs.