The US dollar is the official currency of the United States and is represented by the symbol "$." It is used for everyday transactions, such as buying groceries or paying for services. The dollar is divided into 100 smaller units called cents, making it easy to handle various amounts of money. As one of the most widely used currencies in the world, the US dollar plays a significant role in international trade and finance. Many countries hold dollars as part of their foreign exchange reserves, and it is often used as a standard currency for global transactions, making it essential for the global economy.