"警察" (けいさつ) refers to the police. This is a civil force responsible for maintaining public order and safety, enforcing laws, and preventing and detecting crime. If you need help or see a crime, you would contact the "警察." For example, "警察が事件を調べています" (The police are investigating the incident).

治安を守り、犯罪を取り締まる公的な機関です。例：警察官。