Dynamic components are created inside 3DWorld using a component creator behavior or a pattern filler behavior. A typical dynamic component is a pallet or a box which moves along a path. These components must always be inside a container or on a path, otherwise they will disappear from the 3DWorld. A path is actually a container, also robot's gripper is a container.
Static components are the components that you create using Create page or load from your eCatalog. These components can also be on a path or inside a container. Static components won't disappear from the 3DWorld when robot's gripper releases it. It will however disappear when it exits a path that is not connected to anywhere. All the static components will reappear when you reset the simulation.
In this picture, the component creator creates pallets which are dynamic components and puts them on a conveyor (path). The pallets are also component containers. Pattern filler then fills the container with white boxes which are also dynamic components. When the pallets and the boxes will exit the second conveyor (path) they will disappear from the 3DWorld.