A Functional Specification is a detailed document that outlines the specific functionalities and features of a system or product. It serves as a guide for developers and stakeholders, ensuring everyone has a clear understanding of what the system should do. This document typically includes requirements, use cases, and user interactions, helping to align expectations and facilitate communication throughout the development process. The purpose of a Functional Specification is to provide a comprehensive description of how the system will operate from the user's perspective. It helps in identifying any potential issues early on and serves as a reference point for testing and validation. By clearly defining the scope and requirements, it aids in delivering a product that meets user needs and business objectives.