What are the Non Functional Requirements

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Non Functional Requirements, which determine about the characteristics of non-behavioral operations that are unable to operate the functionalities by using user interface such as Security, Reliability, Availability, Maintainability, Supportability, Performance. They serve as constraints on the design of the system across different backlogs

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Nonfunctional Requirements (NFRs) define system attributes such as security, reliability, performance, maintainability, scalability, and usability. They serve as constraints or restrictions on the design of the system across the different backlogs. Also known as system qualities, nonfunctional requirements are just as critical as functional Epics, Capabilities, Features, and Stories. They ensure the usability and effectiveness of the entire system. Failing to meet any one of them can result in systems that fail to satisfy internal business, user, or market needs, or that do not fulfill mandatory requirements imposed by regulatory or standards agencies. In some cases, non-compliance can cause significant legal issues (privacy, security, safety, to name a few). NFRs are persistent qualities and constraints that, unlike functional requirements, are typically revisited as part of the Definition of Done (DoD) for each Iteration, Program Increment (PI), or release. NFRs influence all backlogs: Team, Program, Solution, and Portfolio. Proper definition and implementation of NFRs is critical. Over-specify them, and the solution may be too costly to be viable; under-specify or underachieve them, and the system will be inadequate for its intended use. An adaptive and incremental approach to exploring, defining, and implementing NFRs is a vital skill for Agile teams

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This describes the attributes a system or process should possess and not a function that system must perform. The documents that are prepared for non-functional requirements are known as Supplementary Support Document (SSD).
In short, non-functional requirements can be described as non-technical requirement such as speed, accuracy, response time.

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Non-functional requirements are also known as quality or supplementary requirements. They capture conditions that do not directly relate to the behavior or functionality of the solution. These can include requirement related to capacity, security, speed, availability and the information architecture and presentation of the user interface. Non-functional requirements may also describe aspects of the system that don't relate to it's execution, but rather to it's evolution over time (e.g. maintainability, extensibility, documentation, etc).

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Non-functional requirements are traditionally the requirements that are more difficult to define, measure, test, and track. In many cases this can lead to teams using only functional requirements or having to constantly evaluate their non-functional requirements for correctness. We can view non-functional requirements then, as the set of requirements that define the ?HOW SHOULD IT BE? aspects of your system.

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When defining purposeful non-functional requirements (NFR?s), teams should begin by defining their non-functional requirements for a wide variety of system attributes. These attributes are categorized within three following aspects of a system:

Operational NFR?s
Revisional NFR?s
Transitional NFR?s