What is the origin of the idiom "keep a low profile" and when to use it?

The idiom "keep a low profile" is believed to have originated in the military, where it refers to the practice of hiding or disguising the presence of troops or military equipment in order to avoid detection by the enemy. The phrase has been used in this context since at least World War II. It is often used to advise someone to avoid drawing attention to themselves, especially when they are in a situation where they might be noticed or observed.