Iterate OperatorBasic Node Parameter
These nodes have one thing in common: They can each output many values per frame. For example, a single iterator node can output the position of each object in the scene.
Iterators correspond to the for next loop commonly used in computer programming. Iterators enable objects, materials, object points and object polygons to all be processed in one go. For example, you could control, say, 47 objects at the same time using the ObjectList iterator by assigning all 47 objects to the iterator and connecting the iterator to the control node.