What are the Non Functional Requirements

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Non-functional Requirements capture conditions that do not directly relate to the behavior or functionality of the solution, but rather describe environmental conditions under which the solution must remain effective or qualities that the systems must have. They are also known as quality or supplementary requirements. These can include requirements related to capacity, speed, security, L availability and the information architecture and presentation of the user interface.
refer to needs that must be fulfilled related to things like the user interface, access security, availability, robustness, system failure, integration, migration  and documentation. As such, they do not deal with the actual functionality of the system, but represent key project success factors nevertheless.

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The requirements that dont actually do any thing but they are considered as important characterstics, Such requirements are called as non functional requirements.
Few examples for non functional requirements are given below.

Performance Requirement
Operating constraints
Platform Constarints
Accuracy & Precision
Madifiability
Protability
Reliability
Security
Usability
Legal

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Non-functional requirements are often called "quality attributes" of a system. Other terms for non-functional requirements are "qualities", "quality goals", "quality of service requirements", "constraints", "non-behavioral requirements", or "technical requirements".Informally these are sometimes called the "ilities", from attributes like stability and portability. Qualities that is non-functional requirements can be divided into two main categories:

1)Execution qualities, such as safety, security and usability, which are observable during operation (at run time).
2)Evolution qualities, such as testability, maintainability, extensible and scalability, which are embodied in the static structure of the system

For Example: Performance , stress testing would be considered as non functional requirement.

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Nonfunctional Requirements (NFRs) define system attributes such as security, reliability, performance, maintainability, scalability, and usability

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Non-Functional requirements are the technical requirements which are resolved by integrating with external peripherals for quality. These are the IT solutions for a requirement.
Ex: Security measures for the payment, how many seconds are required to accept the payment through card (speed).

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Few Non Functional Requirements

Availability:
Efficiency:
Flexibility:
beginning;
Portability:
Integrity:
Performance:
Reliability:
Re-usability:
Scalability:
Usability:

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The challenges in developing non-functional requirements (NFRs) for an application platform go much beyond those for a single application system. To derive platform NFRs from NFR specifications of different domain applications, requirements analysts must deal with much variation of domain specific NFRs, with different deployment configurations and load conditions, with different NFR related trade-offs,
as well as with different terminology and metric definitions
the following main challenges have been identified
Varying domain-specific needs
Varying deployment configurations and load conditions:
Terminology and metrics mismatch
Dealing with NFR trade-offs

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non functional requirements cover the system qualities concerned with the ease with which a user can learn to operate, prepare inputs for, and interpret outputs of a system or component. These non functional requirements measure a products' potential to accomplish the goals of the user.

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A Non Functional requirement is inter related to the functional requirement,
if any software that has been built does not support multiple users, concurrency, dead lock countering mechanism, then the software is of no use from the client point of view,
these non functional requirements are not obvious but they are understood during development, and every software that will be built
are no matter what are ensured to be scalable, reliable, portable, needs to have the fault tolerance, needs to maintain the data integrity,
and every software should be user friendly.

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Non-Functional Requirements: It refers to needs that must be fulfilled related to things. They do not deal with the actual functionality of the system but represents key project success factors nevertheless. List of Non-functional requirements are
user interface,
access security,
Availability,
Robustness,
System Failure,
Integration,
Migration,
Documentation,
Installability,
Maintainability,
Portability,
Reliability,
Scalability,
Multiple Environment Support,
Extensibility,
Reuse,
Operability,
Privacy,
Security.

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Non Functional Requirements:
Non Functional Requirements are the requirements which is like impossible to do..
Non Functional Requirements are the requirements where stake holders ask a BA to apply in the BRD .
For example :1) client wants for a card ( Debit card or Credit card) want bar code scanner but that not possible to get the features in the card.

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Non-functional Requirements (NFRs) mean those requirements that are not related to the functionality of the system as the name says it.

A non-functional requirement places constraints on “How should the software system fulfill the functional requirements?”

Ex: Let’s imagine a online ticket movie booking system. Customers will login to view the latest Movies and booking details. What kind of load it will have when the results are declared? Hundred thousands of Customers will log into the system within ~15 secs of the data being published. The system must be able to handle such a huge load of requests.

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Examples of Non-functional requirements
Here, are some examples of non-functional requirement:

Users must change the initially assigned login password immediately after the first successful login. Moreover, the initial should never be reused.
Employees never allowed to update their salary information. Such attempt should be reported to the security administrator.
Every unsuccessful attempt by a user to access an item of data shall be recorded on an audit trail.
A website should be capable enough to handle 20 million users with affecting its performance
The software should be portable. So moving from one OS to other OS does not create any problem.
Privacy of information, the export of restricted technologies, intellectual property rights, etc. should be audited.

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Nonfunctional Requirements define system attributes such as security, reliability, performance, maintainability, scalability, and usability.

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Non functional requirements capture conditions that do not directly relate to the behavior or functionality of the solution,but rather describe the environmental conditions under which the solution must remain effective or qualities that the systems must have.They are also known as quality or supplementary requirements. These can include requirements related to capacity, speed, security , availability and information architecture and presentation of the user interface