A more thorough explanation:

Definition: The police are a government department that is responsible for maintaining public order, promoting public safety, and preventing and detecting crime.

Examples:

• A police officer directing traffic at a busy intersection
• A police detective investigating a robbery
• A police helicopter searching for a missing person

These examples illustrate the different roles and responsibilities of the police department. The first example shows how police officers help to maintain public order by directing traffic and ensuring that everyone follows the rules of the road. The second example demonstrates how police detectives work to prevent and detect crime by investigating a robbery and gathering evidence to identify the perpetrator. The third example highlights how police departments use various resources, such as helicopters, to promote public safety and search for missing individuals.