Which of the following best describes a prototype?

A prototype is specifically defined as a preliminary model that is created to test a particular design and gather feedback before finalizing the product. It allows engineers and designers to explore ideas and make adjustments based on how the prototype performs in practical applications. This process is vital in engineering design, as it helps identify flaws, assess functionality, and determine user experience before moving on to a more polished version or production.

In contrast, other options refer to broader or different concepts. A generic term for all models would not capture the specific purpose and iterative nature of a prototype. A final version released to production suggests completion, which differs from a prototype that is meant for testing. A written overview of design concepts provides a narrative or summary that does not encompass the tangible, experimental nature of a prototype.