This is the heart of Sandbox Framework which communicates between Actor, Sandbox Subsystems and Sandbox Graph. It registers itself with Sandbox Graph Subsystem at Begin Play and unregisters at End Play. You cannot interact directly with this Component and instead use Sandbox Graph Subsystem. Upon initialization, Sandbox Component will set the tag to itself that was passed from Sandbox Asset (Asset Tag property). Later in gameplay, you can use this information to find the component and its owning actor from Sandbox Graph Subsystem.