What are Functional and Non-Functional requirements?

What are Functional and Non-Functional requirements?

Functional requirements are those requirements which are relatyed to functionality. Whart functionality is required to be performed by system is functional requirement. For example, a functional requirement for Learning management systems (LMS) is allow students to download the assignment file. Non-Functional requirements are quality requirements. For example, LMS should be efficient. Here efficiency is non functional requirement.