Let me tell you about multimodal communication. We, as typical communicators, all use many different strategies. We use speech, gestures, facial expressions, technology, and no-tech solutions. As communicators, we all size up the situation based upon our communication partners, the context, the environment and then we choose to use the most effective communication strategy.
A speech language pathologist is someone who is trained in working with kids and adults. Everything from working with articulation errors and correcting things to what I do, which is working with people with profound physical impairments and getting them augmentative communication strategies.