Answer 1.

Communication is the process of transferring information or ideas from one person or group of persons to other person or groups with an attempt to bring them to the point of view. It is an ongoing process.

These are the aspects of communication

Motivation

Repetition

Reinforcement

Citing example from day to day life.

Message[clear and understandable, specific, timely] 

Audience 

Channels of communication (e. g media)

Answer 2.

Yes I think that Communication can change the face of public health system.