Augmentative and Alternative Communication (AAC) refers to methods and tools that help individuals with communication challenges express themselves. This can include anything from simple picture boards to advanced speech-generating devices. AAC is used by people with various conditions, such as autism, cerebral palsy, or stroke, to improve their ability to communicate. AAC can be categorized into two main types: unaided communication, which relies on the user's body, like gestures or sign language, and aided communication, which involves external tools. These systems aim to enhance communication skills, promote independence, and improve the quality of life for users.