What is the primary characteristic of a Global Volume in Unity?

The primary characteristic of a Global Volume in Unity is that it applies settings globally within the project. This means that adjustments made to a Global Volume will influence all relevant elements throughout the project, rather than being confined to specific scenes or objects. This functionality is particularly useful for maintaining consistent visual styles or environmental settings across different areas of a game.

In contrast, options focusing on local object effects or scene-specific scopes do not accurately represent the global nature of this feature. Global Volumes are designed to maintain a cohesive experience by allowing developers to set parameters that impact the entire project, rather than just isolated instances. Additionally, the suggestion that editing is restricted to administrators is not relevant to the concept of Global Volumes, as their purpose is not tied to access control but to broad application of settings.