In web design, what is a prototype?

A prototype in web design refers to an interactive model of a website that simulates user experience. This phase allows designers and stakeholders to visualize how the final product will work by enabling user interactions with elements like navigation, buttons, and forms. Prototypes are essential in the design process because they provide a tangible representation of the website's layout and functionalities, allowing for early testing and feedback before actual development begins. This iterative process helps in refining the design, identifying usability issues, and making necessary adjustments, ultimately leading to a more effective and user-friendly product.

In contrast, the other choices represent concepts that do not accurately capture the essence of a prototype. A non-functional diagram does not allow for interaction and lacks the ability to simulate user experience. A final product ready for launch implies that the design process is complete, but prototypes are typically earlier in the development cycle. A marketing strategy for web applications focuses on promoting the product rather than its design and usability, which are the core aspects addressed by a prototype.