The medium or communication channel can be impersonal, like or interpersonal, like

a. telephone conversations with a salesperson; mass media a face to face conversation with a salesperson
b. print media billboards; an online chat with a salesperson mass media
c. newspaper ad a radio advertisement; a television advertisement

The medium or communication channel can be impersonal, like telephone conversations with a salesperson, or interpersonal, like mass media a face to face conversation with a salesperson.

Explanation:

impersonal medium are those where the person aren't presence or sharing the same space.

interpersonal communication implite the presence of all the persons involved in the communication in the same place and the same time.

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