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A specification is a detailed and precise description of requirements, characteristics, or conditions that a product, system, or process must meet. It typically defines technical parameters, performance criteria, materials, dimensions, and acceptable tolerances to ensure consistent quality and compatibility. Specifications are used in engineering, software development, manufacturing, and construction to guide design, development, testing, and procurement. They serve as a reference for all stakeholders, helping to avoid misunderstandings and disputes. Clear specifications make it easier to verify whether a result fulfills the intended purpose and complies with agreed standards.