The document provides information about augmentative and alternative communication (AAC) including definitions, types of AAC systems, myths about AAC, and best practices for introducing AAC. It discusses unaided and aided forms of communication, introduces several low-tech communication tools and strategies like aided language displays, PODD communication books, engineering the environment, and use of core vocabulary. The document also addresses high-tech AAC options and the importance of developing communicative competence in AAC users.