Which prototyping type most closely resembles the final product in terms of functionality?

High fidelity prototypes are the type that most closely resembles the final product in terms of functionality. These prototypes typically incorporate a significant amount of detail, including realistic design elements, interactive features, and often the exact materials or technologies that will be used in the final product. They provide a near-authentic experience, enabling users and stakeholders to interact with a representation that closely mirrors the final user interface and user experience.

This proximity to the actual product allows for comprehensive usability testing and feedback collection, which can be crucial for identifying potential issues before the final development phase. High fidelity prototypes are excellent for validating design decisions, ensuring that both the visual aspects and the interactive elements are aligned with user expectations and requirements.

In contrast, low-fidelity prototypes tend to be more simplistic, often using paper sketches or wireframes that lack detailed interaction and visual design, making them less effective in simulating the final product's functionality. Medium fidelity prototypes bridge some of these gaps but still may not capture all the nuances and interactions found in the final design. Mock prototypes, while useful for conceptual discussions, do not typically fulfill the role of testing functionality as directly as high fidelity prototypes do.