Speechreading is the process of understanding spoken language by observing the movements of a person's lips, facial expressions, and body language. It is often used by individuals who are deaf or hard of hearing to supplement their understanding of spoken communication. This skill involves recognizing visual cues and context to interpret what is being said. Speechreading can be enhanced through practice and training, allowing individuals to improve their ability to follow conversations in various settings, even when sound is not available.