A commercial driver is a professional who operates vehicles for business purposes, such as transporting goods or passengers. They typically hold a special license, known as a Commercial Driver's License (CDL), which requires passing specific tests to ensure they can safely handle larger vehicles like trucks and buses. These drivers play a crucial role in the economy by delivering products to stores and transporting people. They must adhere to strict regulations regarding safety, hours of service, and vehicle maintenance to ensure the well-being of themselves and others on the road.