Communication is the active process of exchanging information and ideas. Communication involves both understanding and expression. Forms of expression may include personalized movements, gestures, objects, vocalizations, verbalizations, signs, pictures, symbols, printed words, and output from augmentative and alternative (AAC) devices.
When individuals communicate effectively, they are able to express needs, wants, feelings, and preferences that others can understand.
Beukelman, D. & Mirenda, P. (2013). Augmentative and Alternative Communication: Supporting Children & Adults with Complex Communication Needs 4th Edition. Baltimore: Paul H. Brookes Publishing.