Final answer:
A prototype is a preliminary version of a program used to test design decisions and identify issues before the full system is developed.
Step-by-step explanation:
A prototype is a program that is rapidly implemented and contains only a small part of the anticipated functionality of a complete system. This trial working model is built with the crucial role of testing design decisions and identifying potential problems before the development of the full system continues. Prototyping is a common practice in software development, allowing developers and stakeholders to explore ideas, clarify requirements, and ensure the system's usability.