Class Component is a graph that can be run in runtime just like uNode Runtime does but this can’t be created in the Scene but have an advantage over uNode Runtime like the Class Component graph can be referenced by the others graph without performing compilation.
This graph will be attached to a component on a game object in the scene. This is equivalent of MonoBehaviour in c#. In order to run the graph you can drag & drop the graph to game object in the project view like this:
Or by adding uNode Spawner component and choose the graph like this: