A Class A CDL (Commercial Driver's License) is a certification that allows individuals to operate large commercial vehicles, such as tractor-trailers and buses. This license is essential for drivers who want to transport goods or passengers across state lines. To obtain a Class A CDL, applicants must pass both written and driving skills tests. To qualify for a Class A CDL, drivers typically need to be at least 18 years old for intrastate driving and 21 for interstate driving. Additionally, they must meet specific medical and safety requirements. This license is crucial for those pursuing a career in the trucking or transportation industry.