Original Source Material

A communication channel is the means by which messages get from one individual to another. The nature of the information$-$exchange relationship between a pair of individuals determines the conditions under which a source will or will not transmit the innovation to the receiver and the effect of such a transfer.

References:

Rogers, E$.$ M$.(2003).$ Diffusion of innovations $(5$th ed$.).$ New York: Simon & Schuster.

Student Version

Rogers places great importance on the sharing of information about an innovation. He defines a communication channel as "the means by which messages get from one individual to another" $($p$.18).$ He describes two general media channels of communication: mass media and interpersonal; and two scopes of channels: localite and cosmopolite$.$

References:

Rogers, E$.$ M$.(2003).$ Diffusion of innovations $(5$th ed$.).$ New York: Simon & Schuster.