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A blueprint is defined as a detailed drawing that represents technical specifications of a construction project. This includes precise measurements, materials, and specific instructions that guide the construction process. Blueprints serve as essential documents for builders and contractors, ensuring that everyone involved in the project has a clear understanding of the design and requirements.

In contrast, a rough sketch of a design does not provide the detailed information necessary for construction and typically lacks the technical precision found in blueprints. A collection of photographs of a completed project is not a blueprint; instead, it serves a different purpose by showcasing the final result rather than guiding the construction process. Similarly, a diagram used for project marketing might highlight key features or benefits of a project but does not contain the detailed specifications crucial for execution. Thus, the distinction lies in the level of detail and the intended use of the document, making the definition of a blueprint focused on its comprehensive nature and role in the construction industry.