Canada's electrical supply and electrical outlets (sockets, wall plugs) are the same as those of the United States. 

The electrical supply is 110 Volts and 60 Hertz (cycles per second). 

For visitors arriving from countries that use a different electrical supply, here is a website about international electricity that provides explanation and photos of the adapters and transformers you need for your appliances.   

Another useful website, with photos, can be found here.