My little brother wants to be a police officer when he gets older.
That is great! A police officer is also known as an officer, police person, policeman, policewomen, cop, police agent or police employee. 
Wow so many different names. Is it hard to become one?
No it is not too difficult to become, one but it does require a lot of training. Some police may be trained in special duties such as counter-terrorism, surveillance, child protection, VIP protection, civil law enforcement and investigation techniques into major crimes including fraud, murder, and drug trafficking 
It seems like a dangerous profession to be in.
Yes it can be but they have sworn an oath to protect and serve the citizen in the country. We are lucky to have good law enforcement available to us to keep us safe and the community in order. :)
You are right about that. Do most countries have police officers?
Police officer
A police officer, also known as an officer, policeman, policewoman, cop/copper, garda, police agent, or a police employee is a warranted law employee of a police force. In most countries, "police officer" is a generic term not specifying a particular rank. In some, the use of the rank "officer" is legally reserved for military personnel.
Police officers are generally charged with the apprehension of criminals and the prevention and detection of crime, protection and assistance of the
she put drugs in their drinks and that a police officer is responsible. As Sugan tries to get more information, a female cop (Uma Riyaz Khan) stops Maya from telling the truth and later kills her on the train tracks. Back at home, Sugan gets a message from the female cop, which makes him realize that she is not even a police officer but an assassin. Her next victim is no one other than Varalakshmi (Madhumitha), Sugan's sister. At the temple, Sugan's friend, brother