A more thorough explanation:

Definition: Flag-state control refers to the authority exercised by a country over ships that fly its flag to ensure compliance with safety and environmental laws and regulations.

For example, if a ship is registered in the United States, the U.S. government has the responsibility to ensure that the ship follows all applicable laws and regulations while at sea. This includes making sure the ship has proper safety equipment, follows environmental regulations, and meets other requirements.

Flag-state control is important because it helps to ensure that ships are safe and do not harm the environment. It also helps to prevent accidents and other incidents that could cause harm to people or property.