Stealth Marketing (ste-alth mar-ket-ing)

(also known as undercover marketing) is an unconventional strategy used to attract consumers, using "under the radar" promotional tactics that essentially go unnoticed by your non-target audience, as well as your competition.
1a. Stealth-The act of moving, proceeding, or acting in a covert way.

Some campaigns call for the use of stealth marketing strategies.