What is the origin of the idiom "tough cookie" and when to use it?

The origin of the phrase "tough cookie" is not entirely clear, but it likely stems from the idea of a cookie or biscuit being difficult to break or crumble. The phrase "tough cookie" is used to describe individuals who are resilient and strong-willed. It can be used in various contexts to refer to someone who handles difficult situations with determination. The phrase is commonly used to admire people who demonstrate inner strength and can overcome challenges.