Communication disorders are impairments in sending, receiving, processing, or comprehending verbal or non-verbal concepts. They can range in severity and may be developmental or acquired. Common types include speech disorders involving articulation, fluency, or voice, and language disorders involving content, form, or use. Causes include hearing impairment, physical disabilities, or developmental disabilities. Teachers should provide appropriate language models, communication opportunities, and strategies like expansion and parallel talk to facilitate language development for students with communication disorders.