Intermodal and multimodal transport, usually referred to freight transport can be both separated as well as jointly considered.
Intermodal freight is when an operator uses more than one single mode of transport sequentially whereas multimodal transport relates to the joint use of two mode types at the same time (e.g. a truck that is carried on a ship).
Finally, you could have the two together in the sense that you could have multimodal as well as intermodal freight transport in a origin destination sequence. This is more likely for transoceanic freight movements that might have both
intermodal traits (long leg) as well as multimodal (short leg) ones.