ICE is actually an acronym for referring to an Internal Combustion Engine vehicles. These are your traditional vehicles that require gasoline and have an engine, not a motor.
Combustion is a process that allows energy to be related to the burning of a fuel, which, in this case, is gasoline. Until fairly recently this was the only type of car available on the market, but with the introduction of EVs, which run on battery-powered motors instead of engines or a combination of both, specificity is important.