A more thorough explanation:

Emergency

An emergency is a sudden and serious event that requires immediate action to prevent harm or danger to people, property, or health. It can also refer to an unforeseen change in circumstances that requires urgent attention.

• A fire in a building
• A car accident with injuries
• A natural disaster like a hurricane or earthquake
• A medical emergency like a heart attack or stroke

These examples illustrate how emergencies can happen suddenly and require immediate action to prevent harm or danger. In each case, quick action is necessary to protect people, property, or health.