This document provides an overview of augmentative and alternative communication (AAC). It defines AAC as tools and strategies used to solve communication challenges for those with impairments in speech or language. The document outlines who may need AAC including those with cerebral palsy, autism, traumatic brain injury, and more. It also describes different types of AAC devices from low-tech communication boards to high-tech speech generating devices. Finally, it discusses the role of occupational therapists in assessing patients' needs and abilities to find the best AAC solution.