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What are the key differences between functional and non-functional requirements in software development?

Functional requirements are specific facilities that a system should offer to meet the end user's needs, whereas non-functional requirements are quality constraints that the system must satisfy according to the project contract.

Functional requirements are necessary functionalities that must be incorporated into the system as part of the contract, whereas non-functional requirements are not mandatory.

Examples of functional requirements include what features the system should design and what edge cases to consider in the design, whereas non-functional requirements include issues like portability, security, maintainability, reliability, scalability, performance, reusability, and flexibility.

Functional requirements can be seen directly in the final product, whereas non-functional requirements focus on what users expect from the system in terms of quality and performance.

Non-functional requirements are also called non-behavioral requirements, dealing with issues that are not related to the system's functionality.

Functional requirements specify what the system must do, whereas non-functional requirements describe how the system should do it.

An example of a functional requirement is a login feature, whereas a non-functional requirement would be the minimum latency for each request.

Functional requirements are typically represented in the form of input to be given to the system, the operation performed, and the output expected.

Non-functional requirements are often prioritized based on project needs, with some projects focusing more on security, while others prioritize performance.

Non-functional testing is a type of software testing that verifies whether the behavior of the system meets the non-functional requirements.

Functional requirements provide the foundation for a system, whereas non-functional requirements ensure that the foundation is sturdy, reliable, and user-friendly.

Non-functional requirements can be difficult to define and require a deep understanding of the product's performance and user experience.

There are multiple itys that serve as pillars for a good user experience, including usability, effectiveness, security, scalability, and maintainability.

Functional requirements are easy to define, whereas non-functional requirements require analysis of the product's performance and user experience.

Understanding the distinction between functional and non-functional requirements is crucial for any software development project, as it ensures that the software meets the intended functionality and performance criteria.

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