Can you give an example of a functional and a non-functional requirement?

A functional requirement describes a specific behavior of the system or a function it must perform. For example: "The system must allow the user to create a new order and save it in the database."

A non-functional requirement defines the quality or constraint of the system, not directly related to functions. For example: "The system's response time when creating an order should not exceed 2 seconds." or "The system should be available 99.9% of the time."