Dollar is the name of the official currency of the United States and several other countries.
The term "dollar" originally comes from the German word "Thaler", a large silver coin used throughout Europe for almost four hundred years.
Today, "dollar" refers to:
1. The basic monetary unit of the United States (USD)
2. The currencies of Canada (CAD), Australia (AUD), New Zealand (NZD), and other countries
3. In slang, it can mean money in general ("making big dollars")