What are functional and non-functional requirements in this case?

Functional requirements describe what the system should do — specific functions and behaviors. For example, if the case is an online store, functional requirements may include:

• The user can register and log in.
• Adding products to the cart.
• Placing an order and payment.

Non-functional requirements describe how the system should operate, i.e., qualities and constraints:

• Page response time no more than 2 seconds.
• The system must support 1000 concurrent users.
• Data security of users.

Thus, functional requirements are actions and capabilities, while non-functional are characteristics and constraints of the system.