Triage is the process of determining the priority of a patient's treatment based on the severity of their condition. It is commonly used in emergency rooms and disaster response situations to ensure that the most critically ill or injured patients receive immediate care. Triage involves assessing the patient's symptoms, vital signs, and overall condition to classify them into categories such as emergent, urgent, or non-urgent. This allows healthcare providers to efficiently allocate resources and prioritize care for those in the most critical need.