When adding a Canvas GameObject to the Hierarchy, what else comes bundled with it?

When you add a Canvas GameObject to the Hierarchy in Unity, it automatically generates an Event System alongside it. The Event System is crucial for managing input and interactions within the UI, enabling components like buttons and sliders to respond to user actions. This setup allows for smooth handling of UI elements, ensuring they are functional right from the moment the Canvas is created.

The Event System facilitates the detection of user inputs such as clicks or touches and is responsible for handling events through different input modules. By creating the Event System automatically, Unity streamlines the deployment of UI elements and ensures that developers don’t have to manually set this up each time they create a new Canvas.

Other choices such as an Audio Source, Scriptable Object, or Lighting System do not accompany the Canvas GameObject, as they serve different purposes or require explicit creation by the user based on the needs of the project. This makes the Event System the only relevant addition integrated with the Canvas by default.