Functional requirement defines a function of a software system or its component. A function is described as a set of inputs, the behavior, and outputs. Functional requirements may be calculations, technical details, data manipulation and processing and other specific functionality that define what a system is supposed to accomplish (Source: WikiPedia)

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Definition of "Functional Requirements" by Chat GPT: Functional Requirements are a set of activities that a software system must be able to perform in order to fulfill the requirements of the user or customer. They describe the behavior and capabilities of the system, and are typically expressed in terms of use cases or user stories.
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