A Commercial Driver's License (CDL) is a special license required to operate large or heavy vehicles, such as trucks and buses. It ensures that drivers have the necessary skills and knowledge to safely handle these vehicles on public roads. There are different classes of CDLs, each allowing the operation of specific types of vehicles. To obtain a CDL, applicants must pass both written and driving tests that assess their understanding of traffic laws and vehicle operation. Additionally, drivers may need to meet certain health and age requirements, ensuring they are fit to drive commercial vehicles safely.