Communication systems in hospitals use various methods to exchange information between patients, staff, and machines. Verbal communication informs patients of medical procedures while non-verbal cues like eye contact show care. Formal policies are rigid while informal chatting allows interaction. Technology aids communication for those unable to speak. Signs and symbols help all understand settings. Telephone and pager systems connect staff. Telemedicine allows remote consultations. Public address and CCTV boost security. Color codes standardize emergency responses. Posters further educate.