1, the Canadian dollar symbol refers to the monetary unit of Canada. The formal abbreviation of code is CAD, and the common symbol is C$. The dollar symbol refers to the monetary unit of the United States. The formal abbreviation of the code is USD, and the common symbol is $.

2. The Canadian dollar is the official currency of Canada and is issued by the Central Bank of Canada. The US dollar is one of the most important reserve currencies in the world and is issued by the Federal Reserve.