iterators cursors and ranges in STL

hi, can anyone help me with this? i need to differentiate between the three (iterators, cursors and ranges). I am confused between the three because from all the researches I've done, it seems like they refer to the same concept but putting it in code shows that they don't mean the same thing. which would be better to use for displaying images of different bit sizes (8-bit, 16-bit etc)? this is what i'm using it for. thank you very much. Maybe you could also recommend some helpful resource materials. thank you thank you, i really need much help on this one.