"Supervised driving" refers to a situation where a less experienced driver is accompanied and guided by a more experienced driver, typically to provide support and keep them safe while they practice driving. Full definition
Those under 18 years of age will need to complete a minimum of 50 hours of supervised driving practice before they are allowed to take the driving exam. (drive-safely.net)
Find out how many hours of supervised driving practice you must have to apply for a driver's license. (dmv.org)
In addition, drivers under 18 must also have 40 hours of supervised driving with a driver over 21 years old. (drivingschool.marketing)