What is a promotional message?

Answer 1

pro·mo·tion (prə-mō'shən)
n.
The act of promoting or the fact of being promoted; advancement.
Encouragement of the progress, growth, or acceptance of something; furtherance.
Advertising; publicity.

mes·sage (mĕs'ĭj)
n.

A usually short communication transmitted by words, signals, or other means from one person, station, or group to another.
The substance of such a communication; the point or points conveyed: gestured to a waiter, who got the message and brought the bill.
A statement made or read before a gathering: a retiring coach's farewell message.
A basic thesis or lesson; a moral: a play with a message.

So basically, a promotional message is some sort of communication (whether it be written, drawn, verbalized, whatever) regarding something. Promotional messages are frequently used in public relations and can be seen in a lot of places - billboards, magazine advertisements, on the radio and TV... they are everywhere.

Answer 2

Essentially, an advertisement.