In the US, expansion packs were the general term used.
For example, RCT2 had the Wacky Worlds and Time Twister expansion packs. Empire at War had the Forces of Corruption expansion. While some were called add-ons, those were typically like tiny things, one-off characters or whatever.
Yes, but those were called addons once upon a time. Before addons were user scripts or mods, etc.
At least that’s what they were called in Germany.
In the US, expansion packs were the general term used.
For example, RCT2 had the Wacky Worlds and Time Twister expansion packs. Empire at War had the Forces of Corruption expansion. While some were called add-ons, those were typically like tiny things, one-off characters or whatever.