What type of program implements only the most essential structures without specific details?

The appropriate choice for a program that implements only the most essential structures without specific details is a prototype program. A prototype program serves as a preliminary model used to demonstrate or test concepts, ideas, or functionality without delving into detailed implementation.

Prototypes are typically designed to quickly convey the core functionality and basic structure of the final product, allowing developers and stakeholders to evaluate and provide feedback early in the development process. They omit extensive details to focus on the main features and structure, making it easier to explore and refine ideas without the burden of complete implementation.

In contrast, skeleton code refers to a framework for a program that includes the basic structure and predefined methods, but is often more detailed than a prototype. Tracer round programs usually involve debugging or testing code execution, providing visual insight into program flow rather than serving as an essential structure model. Debug programs focus on identifying and fixing errors within existing code rather than establishing initial structure or functionality.