Final answer:
The Theory of Diffusion of Innovation explains how innovations spread through communication channels among members of a society over time, as developed by Everett Rogers in 1962.
Step-by-step explanation:
The theory that uses a process through which an innovation spreads via certain communication channels over time among members of a social system is the Theory of Diffusion of Innovation. This theory was developed by sociologist Everett Rogers in 1962 and explains how an innovation reaches market saturation within a society through different stages of adoption by its members. It is a key concept in understanding how new ideas, technologies, or practices are adopted and become widespread within a culture.