Click below for some useful links about STV:
Click “1.3 An example” to see the simplified illustration of how the vote occurs.
Click 4 “in practice” for links to jurisdictions that use it (Ireland and Malta, plus the Australian senate and (maybe?) one state, and some local council elections in New Zealand).
The Citizens Assembly’s Flash-animated explanation of how STV works:
An article on the US site fairvote.org about the ramifications of STV:
Links on fairvote.org to voting systems in various countries: