I think Zig does a very good illustration of this distinction. They separate: - enum: essentially just a typed uint tag collection - union: the plain data str

I think Zig does a very good illustration of this distinction. They separate: - enum: essentially just a typed uint tag collection - union: the plain data structure that can contain any of several types - tagged union: combines enums and unions, so you can dispatch on its tag to get one of the union types Read from this section and they appear in order: https://ziglang.org/documentation/master/#enum https://ziglang.org/documentation/master/#enum