A chief of police is like the boss of all the police officers in a city or town. Just like how a teacher is in charge of a classroom, the chief of police is in charge of all the police officers in their city.
They make sure that the police officers are doing their job and following the rules. They also make decisions about buying new equipment for the police force, like new uniforms or new police cars.
If there's a big problem or a crime in the city, the chief of police is the one who makes the plan to fix it or to catch the bad guy. They work with other leaders in the city like the mayor or city council to make sure everyone is safe and happy.
Overall, the chief of police's job is to make sure the police force is doing what it's supposed to do and keeping the city safe.