Communications question

What is considered as formal , informal, verbal and nonverbal, please need brief explanation with an example.

Thank you very much for the helpful info.


Formal : You prepare a customer Report/Analysis with details OR Specifications, Standards or Legal documents etc

Informal - day 2 day e-mail correspondence

Verbal - your telephonic/hallway conversations etc

Non Verbal - Body language, gestures -  Thumbs Up/Down, eye brows/hands movement etc