What are the function requirement and non function requirement for online shopping system?

In an online shopping system, functional requirements define what the system must do, such as user registration, product search, shopping cart management, secure payment processing, order confirmation, and inventory updates. These ensure smooth operation and user interaction. On the other hand, non-functional requirements focus on how the system performs — including security, scalability, reliability, speed, usability, and data privacy. Together, they ensure the platform not only works correctly but also delivers a fast, safe, and enjoyable shopping experience for users.