Don’t we already have coalitions?

I have been following the coverage of the Canadian election with my usual-wish-I-could-vote interest.

Everyone is so exercised about coalitions. But Canada’s a constitutional monarchy. It’s got a parliament. What exactly do you call it when no party wins a majority and then other parties vote with them to keep them in power? I think we already have a coalition and have had them for quite some time now. . . .