The Diffusion of Innovations Theory explains how new ideas and technologies spread within a society. Developed by Everett Rogers, the theory identifies five categories of adopters: innovators, early adopters, early majority, late majority, and laggards. Each group has different characteristics and influences the rate at which innovations are adopted. The theory emphasizes the importance of communication channels, social systems, and the perceived attributes of innovations, such as their relative advantage, compatibility, complexity, trialability, and observability. Understanding these factors helps organizations and individuals promote and implement new ideas effectively within their communities.