Definitions for "Narrowcasting"
Using electronic media to reach a specific audience.
Using a broadcast medium to appeal to audiences with special interests. For example, a specialist computing channel would be a narrowcast, because it appeals to an audience with a specific interest.
Channelling messages into electronic medium in such a way as to reach small well-defined specialist audiences, eg. with cable television. Opposite to broadcasting.
Keywords:  niche, aimed, know, find, search
When in search for the niche market, it helps to know how to find them.
Creating a program aimed at a small and specific niche or group of people.