More widely known as synchronised swimming, this women-only discipline was introduced to Olympic competition at Los Angeles 1984, although formats have varied from one Games to the next.
Since Sydney 2000, the programme has featured both duet and team events.
Historically, Russia has dominated the medal table, winning 10 of 18 gold medals - twice as many as second-placed USA. They won both duet and team titles at Rio 2016, with Natalia Ishchenko and Svetlana Romashina featuring in both victories.
New Zealand has only contested artistic swimming twice at the Olympics - the last occasion was Beijing 2008 - and although it qualified a team for Tokyo, the national body chose not to take up that opportunity.