

In most contexts, we’re mostly talking about Single-Winner elections.
In the context of electoral systems, “Congress” and “Senate” are multi-seat legislatures. Hence the talk about proportional representation, IE how many Americans vote Democrat vs how many Democrats get elected. Without that discussion you’ll never get a 3rd party elected.
We studied it in Canada, including how it was used in Australia, and it was the only electoral systems out of all the ones listed that actually widened the gap between voter intention and seat distribution from FPTP.
https://www.ourcommons.ca/documentviewer/en/42-1/ERRE/report-3/page-174#49
Specifically here, where it is called “Alternative Vote”:
https://www.ourcommons.ca/content/Committee/421/ERRE/Reports/RP8655791/errerp03/06-RPT-Chap4-e_files/image002.gif
I’m mostly just frustrated about how it keeps getting renamed.
But it is entirely possible to invent an electoral system that is worse than what we have now, and it seems politicians might have done that with IRV.