What is the origin of the idiom "have the wind at one's back" and when to use it?

The idiom "have the wind at one's back" comes from nautical terminology and refers to the wind being behind a ship, making it easier to sail. The idiom means having favorable conditions or circumstances that make it easier to achieve a goal or succeed, beyond just sailing.The usage of this idiom has since expanded beyond its original nautical context and can now refer to any situation where someone has favorable conditions or circumstances working in their favor, making it easier to achieve a goal or succeed in a particular endeavor.