This document discusses the diffusion of innovations, which refers to how new products, services, ideas or practices are adopted by consumers over time through communication channels. There are two key processes involved - diffusion, which is the spread of an innovation from its source to the public, and adoption, which involves the stages consumers go through in deciding whether to accept or reject an innovation. The rate of adoption depends on factors like an innovation's relative advantage, compatibility, complexity, trialability and observability. The document outlines the innovation adoption process and categories of adopters from innovators to laggards.