Landespolizei is a group of police officers who work in a specific region of a country, like a state or province. They are responsible for making sure the people who live there are safe and following the law.
Just like how a teacher has rules for their classroom, the government has rules for their region, and the Landespolizei makes sure those rules are being followed.
They wear special uniforms, have police cars and trucks, and can use things like handcuffs and pepper spray to keep people safe. If you have an emergency, you can call them and they will help you.