Discuss the difference between the following types of communication.

A$)$ Internal vs$.$ External Communication

B$)$ Inward vs$.$ Outward communication

C$)$ Formal vs$.$ Informal Communication

D$)$ Verbal vs$.$ Non$-$verbal Communication

Write a formal letter assuming your$-$self as a manager of a certain organization $($to other Organization$)$ by the following points

a$)$ Letter of Application for job vacancy

b$)$ Request Letter

c$)$ Company address change letter

Mention the principles of good listening & explain why they are important?