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A narrowcast or narrowcasting is the process of sending specific data to a limited, selected or narrower number of recipients. It enables restriction the transmitted data to be delivered only to selected individuals, organizations, devices and/or equipment.
A narrowcast also may be referred to as a multicast.
A narrowcast primarily enables segmenting and categorizing the data transmission on a specific network or communication environment. The most common example of narrowcast is employed by cable TV operators that send cable TV signals only to the homes of their subscribers.
Narrowcasting is also implemented in Internet and networking technologies. For example, access to a private server is restricted and broadcast to only selected employees or users. Similarly an email message can be sent only to a narrow list of recipients.