A commercial driver's license (CDL) is a special license required to operate large or heavy vehicles, such as trucks, buses, and taxis. It ensures that drivers have the necessary skills and knowledge to safely handle these vehicles on public roads. Obtaining a CDL typically involves passing written and driving tests. There are different classes of CDLs, each allowing drivers to operate specific types of vehicles. For example, a Class A CDL permits driving combination vehicles, while a Class B CDL is for single vehicles over a certain weight. Proper training and adherence to regulations are essential for maintaining safety on the roads.