The Interactable Object is something the player can choose to interact with similar to how the player can interact with a friendly NPC like shop keeper. These kind of objects could be doors, chests, or even traps that can be disabled.
To create such an object you simply add Component > plyGame > Objects > Interact Object to a GameObject. You will probably want a plyBlox on the the object too so that you can create responses to Events triggered by the interaction. The plyGame > Object group contains events that are triggered on the object or character being interacted with while you will also find interact related events in plyGame > Actor that are triggered for the character doing the interaction.