Diffusion of Innovations (DOI) theory describes how new ideas and technologies spread through populations over time. The theory outlines how individuals adopt innovations in categories from innovators to laggards. The DOI process involves individuals gaining knowledge of an innovation, forming perspectives, making adoption decisions, implementing the innovation, and continuing or discontinuing use. Factors like relative advantage, compatibility, complexity, trialability, and observability influence adoption rates. DOI can help understand technology adoption in schools and apply strategies to introduce innovations systematically.