This document discusses augmentative and alternative communication (AAC), including why it is important, who uses it, and different forms it can take. AAC is used to supplement or replace speech and writing for those with communication impairments. It involves using symbols, which can include pictures, objects, signs, or spelling, to represent concepts, actions, and language. The meaning of symbols may depend on culture and familiarity. The goal of AAC is to enable people to communicate effectively and participate in daily interactions and activities.