A more thorough explanation:

Law enforcement refers to the detection and punishment of violations of the law. This includes enforcing criminal laws as well as noncriminal laws such as national-security laws. It involves police officers and other members of the executive branch of government charged with carrying out and enforcing the criminal law.

For example, if someone breaks into a house and steals something, law enforcement officers will investigate the crime and try to find the person responsible. They will gather evidence, interview witnesses, and make an arrest if they have enough evidence to do so. The person will then be prosecuted and punished if found guilty.

Another example is enforcing traffic laws. Police officers are responsible for making sure people follow the rules of the road. If someone is caught speeding or running a red light, they may be given a ticket or even arrested if they are driving under the influence of drugs or alcohol.