Diffusion of Innovation describes the process by which an innovation is communicated through certain channels over time among members of a social system. It has four main elements: (1) an innovation, (2) communication channels, (3) time, and (4) a social system. An innovation is defined as a new idea or method and has characteristics like relative advantage, compatibility, complexity, trialability, and observability that determine how quickly it is adopted. Communication channels are how messages spread between individuals, while time refers to the innovation decision process and rate of adoption. A social system is a set of interconnected units working towards a common goal.