What role does metadata play in ArcGIS Online?

Metadata plays a crucial role in ArcGIS Online by providing detailed information about geographic data, including its origin, purpose, and usage rights. This information is essential for users to understand the context and credibility of the data they are working with. By describing the source of the data, metadata helps users assess its reliability and relevance to their projects. Additionally, it outlines any restrictions or permissions regarding data usage, ensuring compliance with copyright and privacy regulations.

The other choices focus on different aspects of data management and visualization. Operational instructions pertain to how users might interact with the system or data, which is not the primary function of metadata. Automation of the mapping process refers to software capabilities rather than the descriptive nature of metadata. Enhancing visual representation involves styling and presentation aspects that go beyond simply documenting the characteristics of the data. Thus, metadata's pivotal role in ensuring proper understanding and usage of geographic data aligns closely with the correct option regarding its description of source and usage rights.